If a student had 28 moles of solid carbon would that be enough to produce 15 moles of C2H6

Answers

Answer 1

No, 28 moles of solid carbon would not be enough to produce 15 moles of [tex]C_2H_6[/tex] (Ethane).

This is because the reaction requires more than 1 mole of carbon to produce 1 mole of [tex]C_2H_6[/tex]. The mole ratio of [tex]C_2H_6[/tex]:C is 2:1, so 28 moles of carbon would only be enough to produce 14 moles of [tex]C_2H_6[/tex].A chemical compound having the molecular formula  [tex]C_2H_6[/tex], ethane is an organic substance. Ethane is an odourless, colourless gas at ordinary pressure and temperature. Ethane is separated from natural gas on an industrial scale, and it is produced as a by-product of the petrochemical process used to refine crude oil. Its primary usage is as a feedstock for the creation of ethylene.The ethane moiety is known as an ethyl group, and it can be used to create related compounds by swapping out a hydrogen atom for another functional group.

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Related Questions

Which statement describes gases
according to kinetic molecular theory?

Answers

According to the kinetic molecular theory, gases are described by the following statement:

Gases consist of small particles (atoms or molecules) that are in constant random motion.

What does the statement mean

This statement highlights that gases are made up of particles that are in constant motion, moving in straight lines until they collide with another particle or the walls of the container.

The motion of gas particles is random, and their energy increases as the temperature of the gas increases. The kinetic molecular theory also suggests that the particles in a gas are far apart from each other and do not attract or repel each other, except during collisions.

Additionally, the kinetic molecular theory states that the pressure of a gas is caused by the collisions of gas particles with the walls of the container. The higher the concentration of gas particles or the faster they are moving, the greater the pressure of the gas.

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Help please
2.0 mol of Ca(OH)2 are mixed with 2.0 mol of HCl according to the following equation:
Ca(OH)2+2HCl=CaCl2+2H2O
a. Which chemical is in excess and which is limiting reactant?
b. What is the excess in grams?
c.Theoretically, how many moles of H2O will be produced?

Answers

Answer:

Explanation:

Limiting is HCl and excess is Ca(OH)2

excess is 296 grams Ca(OH)2

2 moles H2O will be formed

What is the IUPAC-name for this thing? ​

Answers

The IUPAC name for the compound given in the question is 2,3-dibromo-5-methylheptane

How do i determine the IUPAC name for the compound?

The IUPAC name for compound can be obtained by using the following steps:

Locate the longest continuous carbon chain. In this case it is carbon 7. Hence, the parent name is heptaneIdentify the substituent groups attached. In this case the substituent groups attached are: Br and CH₃ Give the substituents the best possible low count. In this case, there are two Br groups located at carbon 2 and 3 while the CH₃ is located at carbon 5Combine the above to obtain the IUPAC name for the compound.

Thus, the IUPAC name for the compound is: 2,3-dibromo-5-methylheptane

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Part 1: How many oxygen atoms are in one mole of the formula Al2(CO3)3?
Part 2: How many moles of carbon are in 3.5 moles of calcium carbonate?

Answers

There are therefore a total of 14 atoms: 2 Al, 3 C, & 9 O. In other words, 3.5 moles of calcium carbonate will contain 3.5 moles if carbon because each mole of calcium carbonate has one mole of carbon.

How is carbon in CaCO3 calculated?

Hence, 40.078 divided by 100.086 everything multiplied by 100% represents the mass percentage for calcium in calcium carbonate. This yields a value of almost 40%. Carbon's mass percentage is calculated by taking 12.011 and dividing it by 100.086, then multiplying that result by 100% to get a number of roughly 12 percent.

How many oxygen atoms make up Al2O3?

The subscripts (2 and 3) in this formula indicate how so many atoms will make up one unit of the molecule. There are two aluminium atoms and three oxygen atoms, respectively, denoted by the numbers 2 and 3.

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How many molecules of HCI are in 4.91 L of HCI acid at 25°C if the density equals 1.096 g/ml

Answers

To determine the number of HCl molecules in 4.91 L of HCl acid at 25°C, we can use the following steps:

Calculate the mass of the HCl acid in 4.91 L using its density.Convert the mass of HCl acid to the number of moles using its molar mass.Use Avogadro's number to convert the number of moles of HCl to the number of HCl molecules.Calculate the mass of the HCl acid in 4.91 L using its density:

[tex]\qquad\sf {Density = \dfrac{mass}{volume}}[/tex]

[tex]\qquad\sf{mass = density \times volume}[/tex]

[tex]\qquad\sf{mass = 1.096 \: g/mL \times 4.91\: L = 5.38\: kg}[/tex]

Convert the mass of HCl acid to the number of moles using its molar mass. The molar mass of HCl is 36.46 g/mol.

[tex]\sf{moles = \dfrac{mass}{ molar\: mass} = \dfrac{5.38\: kg}{36.46\: g/mol} = 147.6\: mol}[/tex]

Use Avogadro's number to convert the number of moles of HCl to the number of HCl molecules. Avogadro's number is [tex]6.02 \times 10^23[/tex] molecules/mol.

[tex]\sf number\: of\: HCl\: molecules = moles \times Avogadro's\: number[/tex]

[tex]\begin{aligned}\sf number\: of\: HCl\: molecules& =\sf 147.6 \: mol \times 6.02 \times 10^23\: molecules/mol \\& =\sf 8.88 \times 10^25\: molecules\end{aligned}[/tex]

Therefore, there are [tex]8.88 \times 10^25[/tex] HCl molecules in 4.91 L of HCl acid at 25°C, assuming the density of the acid is 1.096 g/mL.

[tex]\rule{200pt}{5pt}[/tex]

Which of the following occurs in an endothermic reaction but not in an exothermic reaction?
A. Chemical bonds are broken.
B. Atoms are rearranged.
C. Energy is absorbed.

Answers

Answer:

C. Energy is absorbed.

Explanation:

In an endothermic reaction, energy is absorbed from the surroundings, resulting in an increase in the internal energy of the system. This means that the products of the reaction have a higher energy content than the reactants, and energy is stored in the chemical bonds of the products.

Therefore, option C, energy absorption, occurs in an endothermic reaction.

Which statement best describes the law of conservation of mass?(1 point)


A) Reactants in a chemical reaction rearrange to form a new substance or substances.

Not college level lol

B) Reactants and products cannot escape from a closed system.


C) Matter cannot be created or destroyed in a chemical reaction.


D) Chemical symbols are used to show atom balance before and after a reaction.


Lesson name) Balanced Chemical Equations Quick Check.

Answers

The correct answer is C) Matter cannot be created or destroyed in a chemical reaction. The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products, meaning that matter cannot be created or destroyed. This law is a fundamental principle in chemistry and is important for balancing chemical equations.
The answer is c. Matter cannot be created or destroyed in a chemical reaction.

Match these

Hypothesis
Independent Variable
Conclusion

Amount of water
if a plant receives more water it will grow more
100mL of water yielded the highest mass and height of plants

Answers

The conclusion is the result of the experiment, which supports the hypothesis by stating that 100mL of water yielded the highest mass and height of plants.

Hypothesis: If a plant receives more water, it will grow more.

Independent Variable: Amount of water.

Conclusion: 100mL of water yielded the highest mass and height of plants.

In this experiment, Hypothesis states the relationship between the independent variable and the dependent variable. The independent variable is the amount of water, and the dependent variable is the growth of the plants.

The conclusion is the result of the experiment, which supports the hypothesis by stating that 100mL of water yielded the highest mass and height of plants.

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Conservation of Mass In chemical reactions, mass is neither gained nor lost. The total mass of all the reactants equals the total mass of all the products. Atoms are just rearranged into different compounds. Using this idea, solve the following problems. 1. 2KCIO3 2KCI+ 30₂ If 500 g of KCIO, decomposes and produces 303 g of KCI, how many grams of O₂ are produced? 2. N₂ + 3H₂ 2NH3 How many grams of H₂ are needed to react with 100 g of N₂ to produce 121 g of NH₂? 3. 4Fe +30₂ 2Fe₂O3 How many grams of oxygen are needed to react with 350 g of iron to produce 500 g of Fe₂O3? 4. CH₂ + 20₂2 CO₂ + 2H₂O 16 g of CH₂ react with 64 g of O₂, producing 44 g of CO₂ How many grams of water are produced? 5. CaCO3 Cao + CO, How much CO, is produced from the decomposition of 200 g of CaCO, if 112 g of CaO are produced?​

Answers

Answer:

1. The balanced equation is 2KCIO3 → 2KCI + 3O2. According to the law of conservation of mass, the mass of the reactants must equal the mass of the products. Therefore, the mass of oxygen produced is:

Mass of oxygen = Mass of KCIO3 - Mass of KCI

Mass of oxygen = 500 g - 303 g

Mass of oxygen = 197 g

Therefore, 197 g of O2 are produced.

2. The balanced equation is N2 + 3H2 → 2NH3. We need to find out how much H2 is needed to react with 100 g of N2 to produce 121 g of NH3. First, we need to calculate the number of moles of N2 and NH3:

Moles of N2 = Mass of N2 / Molar mass of N2

Moles of N2 = 100 g / 28 g/mol

Moles of N2 = 3.57 mol

Moles of NH3 = Mass of NH3 / Molar mass of NH3

Moles of NH3 = 121 g / 17 g/mol

Moles of NH3 = 7.12 mol

According to the balanced equation, 1 mole of N2 reacts with 3 moles of H2 to produce 2 moles of NH3. Therefore, the number of moles of H2 needed is:

Moles of H2 = Moles of N2 x (3/1)

Moles of H2 = 3.57 mol x 3

Moles of H2 = 10.71 mol

Finally, we can calculate the mass of H2 needed:

Mass of H2 = Moles of H2 x Molar mass of H2

Mass of H2 = 10.71 mol x 2 g/mol

Mass of H2 = 21.42 g

Therefore, 21.42 g of H2 are needed.

3. The balanced equation is 4Fe + 3O2 → 2Fe2O3. We need to find out how much oxygen is needed to react with 350 g of Fe to produce 500 g of Fe2O3. First, we need to calculate the number of moles of Fe and Fe2O3:

Moles of Fe = Mass of Fe / Molar mass of Fe

Moles of Fe = 350 g / 55.85 g/mol

Moles of Fe = 6.26 mol

Moles of Fe2O3 = Mass of Fe2O3 / Molar mass of Fe2O3

Moles of Fe2O3 = 500 g / 159.69 g/mol

Moles of Fe2O3 = 3.13 mol

According to the balanced equation, 4 moles of Fe react with 3 moles of O2 to produce 2 moles of Fe2O3. Therefore, the number of moles of O2 needed is:

Moles of O2 = Moles of Fe x (3/4)

Moles of O2 = 6.26 mol x (3/4)

Moles of O2 = 4.69 mol

Finally, we can calculate the mass of O2 needed:

Mass of O2 = Moles of O2 x Molar mass of O2

Mass of O2 = 4.69 mol x 32 g/mol

Mass of O2 = 150.08 g

Therefore, 150.08 g of O2 are needed.

4. The balanced equation is CH2 + 2O2 → CO2 + 2H2O. We know that 16 g of CH2 reacts with 64 g of O2 to produce 44 g of CO2. We need to find out how much water is produced. First, we need to calculate the number of moles of CH2 and CO2:

Moles of CH2 = Mass of CH2 / Molar mass of CH2

Moles of CH2 = 16 g / 14 g/mol

Moles of CH2 = 1.14 mol

Moles of CO2 = Mass of CO2 / Molar mass of CO2

Moles of CO2 = 44 g / 44 g/mol

Moles of CO2 = 1 mol

According to the balanced equation, 1 mole of CH2 reacts with 2 moles of O2 to produce 2 moles of H2O. Therefore, the number of moles of H2O produced is:

Moles of H2O = Moles of CH2 x (2/1)

Moles of H2O = 1.14 mol x 2

Moles of H2O = 2.28 mol

Finally, we can calculate the mass of H2O produced:

Mass of H2O = Moles of H2O x Molar mass of H2O

Mass of H2O = 2.28 mol x 18 g/mol

Mass of H2O = 41.04 g

Therefore, 41.04 g of H2O are produced.

5. The balanced equation is CaCO3 → CaO + CO2. We need to find out how much CO2 is produced from the decomposition of 200 g of CaCO3 if 112 g of CaO are produced. First, we need to calculate the number of moles of CaCO3 and CaO:

Moles of CaCO3 = Mass of CaCO3 / Molar mass of CaCO3

Moles of CaCO3 = 200 g / 100.09 g/mol

Moles of CaCO3 = 1.999 mol

Moles of CaO = Mass of CaO / Molar mass of CaO

Moles of CaO = 112 g / 56.08 g/mol

Moles of CaO = 1.999 mol

According to the balanced equation, 1 mole of CaCO3 produces 1 mole of CaO and 1 mole of CO2. Therefore, the number of moles of CO2 produced is:

Moles of CO2 = Moles of CaCO3 x (1/1)

Moles of CO2 = 1.999 mol

Finally, we can calculate the mass of CO2 produced:

Mass of CO2 = Moles of CO2 x Molar mass of CO2

Mass of CO2 = 1.999 mol x 44 g/mol

Mass of CO2 = 87.96 g

Therefore, 87.96 g of CO2 are produced.

Which of the following are the products and reactants of a chemical reaction most likely to have in common?
1. Atoms
2. Molecules
3. Chemical properties

Answers

Answer:

1. Atoms

Explanation:

The products and reactants of a chemical reaction are usually related in terms of their atoms and molecules. During a chemical reaction, atoms are rearranged to form new molecules, and these new molecules are the products of the reaction. However, the atoms themselves are not created or destroyed in the process.

For example, if we consider the combustion of methane (CH4) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), the reactants (methane and oxygen) and the products (carbon dioxide and water) are all made up of the same types of atoms (carbon, hydrogen, and oxygen), but they are rearranged in different ways. The chemical properties of the reactants and products may differ, but they are still related in terms of their atomic and molecular composition.

It's difficult though to say which is more likely between atoms and molecules because they are both essential components of chemical reactions. In a chemical reaction, atoms combine to form molecules or break apart from molecules to form new molecules. Therefore, both atoms and molecules are important in a chemical reaction.

However, if we had to choose one that is more likely to be common between the reactants and products, it would probably be atoms. This is because in most chemical reactions, the atoms involved in the reactants are rearranged to form the products. The chemical reaction simply involves the rearrangement of the atoms, but the atoms themselves are not created or destroyed

On the other hand, molecules may change significantly during a chemical reaction, as they are made up of specific arrangements of atoms. The chemical properties of the reactants and products may also differ because of changes in the molecular structure. Therefore, while molecules are still an essential part of chemical reactions, it is more likely that atoms will be common between the reactants and products.

I have included an overview of the topics you MUST include in your presentation.
Topic Outlines:

Biomass (10 points)

1. What does “Biomass” mean? How is Biomass being used today as a substitute for gasoline to run cars, trucks or buses?

2. What are some different ways Biomass is being used to heat homes today?

3. Name and explain 3 advantages/disadvantages in using Biomass compared to using Fossil Fuels or other alternative energies (specifically include environmental issues that can happen).

4. Explain the energy conversions when producing energy with Biomass. (Use the words: Potential Energy and Kinetic Energy).

Geothermal (10 point)
5. Where does geothermal energy come from?

6. How can geothermal energy be used to create electricity?

7. How can geothermal energy be used directly to heat homes and factories?

8. What is a “heat pump”?

9. Name and explain 3 advantages and disadvantages in using geothermal energy compared to using fossil fuels and other alternative energies. (Specifically include environmental issues that can happen).

Hydroelectric (10 points)

10. What is a good definition of hydroelectric power?

11. How does “moving water” get turned into electrical energy? Explain each part of the dam from the moving water to production of electricity.

12. Name and explain 3 advantages/disadvantages of getting electricity from hydroelectric power and how it compares to using fossil fuels or alternative energies. (specifically include environmental issues that can happen

13. Find one example in the U.S. that uses hydroelectric power to create electricity?

Answers

Biomass refers to any organic matter that comes from plants or animals, such as wood chips, crop residues, or animal waste. Biomass can be converted into various forms of energy, such as electricity, heat, and fuel, and is being used as a substitute for gasoline to run cars, trucks or buses by converting it into biofuels like ethanol, biodiesel, or biogas.

Biomass can be used to heat homes in several ways, such as burning wood pellets or chips in stoves or boilers, using agricultural waste or wood waste as fuel, or installing biogas digesters that can produce heat from organic waste.

Advantages of using biomass include:

1. Its renewable nature,

2. Its potential to reduce greenhouse gas emissions and dependence on fossil fuels, and

3. Its ability to provide local sources of energy.

Disadvantages include:

1. The high cost of production and transportation

2. The potential for deforestation and habitat loss

3. The release of pollutants and greenhouse gases during combustion

When producing energy with biomass, the potential energy stored in the organic matter is converted into kinetic energy by burning it or using other processes, such as gasification or pyrolysis, to release the energy. This kinetic energy can then be harnessed to generate electricity, heat, or fuel.

Geothermal energy comes from the heat that is generated from the Earth's core and mantle.

Geothermal energy can be used to create electricity by drilling wells into the Earth's crust and pumping hot water or steam to the surface, which can then drive turbines that generate electricity.

Geothermal energy can be used directly to heat homes and factories by circulating hot water or steam through pipes or using geothermal heat pumps.

A heat pump is a device that transfers heat from one place to another, such as from the ground to a building's heating system, by using a refrigerant to absorb and release heat.

Advantages of using geothermal energy include:

1. its low emissions and high efficiency,

2. its reliability and consistency,  

3. its potential for use in remote areas.

Disadvantages include:

1. the high upfront cost of installation,

2. the potential for depletion of geothermal reservoirs,

3. the risk of earthquakes and other geological hazards.

Hydroelectric power is a form of renewable energy that harnesses the power of moving water to generate electricity.

Moving water is channeled through a dam, which drives turbines that spin generators to produce electricity. The water is then released back into the river or diverted to another body of water. The dam also serves to regulate the flow of water and prevent flooding.

Advantages of using hydroelectric power include:its renewable nature, its potential for reliable and consistent power generation its ability to provide flood control and irrigation. Disadvantages include: the disruption of aquatic ecosystems, the potential for methane emissions from flooded land,  the high upfront costs of building dams and other infrastructure.

Hoover Dam, located on the Colorado River on the border between Arizona and Nevada, is a major example of a hydroelectric power plant in the U.S

What is the history of hydroelectric power?

The history of hydroelectric power dates back to the 19th century, with the development of water turbines and generators. The first hydroelectric power plant was built in Appleton, Wisconsin in 1882, by a man named H.J. Rogers.

However, the concept of using water to produce mechanical power had been around for centuries. In ancient times, waterwheels were used to power mills and other machinery, and in the Middle Ages, water power was used to operate various devices, such as water pumps, sawmills, and hammers.

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Sheila spilled tea on her notes and is now unable to read some words.
What is the correct title for this section of Sheila's notes?
Volume
Density
Weight
Mass

Answers

Based οn the wοrds prοvided, a pοssible title fοr this sectiοn οf Sheila's nοtes cοuld be Mass.

What are Prοperties οf Matter in chemistry?

In chemistry, prοperties οf matter refer tο the characteristics οr attributes that can be used tο describe and identify a substance. These prοperties can be divided intο twο categοries: physical prοperties and chemical prοperties.

Physical attributes are thοse that can be examined οr measured withοut changing the substance's makeup. Mass, vοlume, density, cοlοr, melting pοint, bοiling temperature, and sοlubility are examples οf physical qualities.

Chemical prοperties, οn the οther hand, describe hοw a substance interacts with οther substances tο prοduce new substances.

Understanding the prοperties οf matter is impοrtant in chemistry because it allοws scientists tο identify and classify different substances based οn their unique characteristics. This knοwledge can alsο be used tο predict hοw substances will behave under different cοnditiοns and tο design new materials with specific prοperties fοr variοus applicatiοns.

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Complete question:

Sheila spilled tea on her notes and is now unable to read some words.

What is the correct title for this section of Sheila’s notes?

Volume Density Weight Mass

What is the percent of Ca in
Ca(C2H3O2)2?
(Ca = 40.08 g/mol, C = 12.01 g/mol,
H= 1.01 g/mol, O = 16.00 g/mol)
[?] % Ca

Answers

Answer:

25.3%

Explanation:

Since

Ca has just 1 mole

Ca ×1 = 40.08

C has 4 moles

C×4 = 48.04

H has 6 moles

H×6 = 6.06

O has 4 moles

O×4 = 64

64+6.06+48.04+40.08=158 (approx.)

40.08÷158 ×100% = 25.3%

Hydrogen (10 points)

14. What does using hydrogen as a fuel source mean? How is it combined to create an energy source?

15. Explain where hydrogen is found. What are sources of hydrogen found on Earth?

16. Name and explain 3 advantages/disadvantages of using hydrogen as a fuel source and how it compares to using fossil fuels and other alternative energies (specifically include environmental issues that can happen.

17. What is a fuel cell? How does it work? (include diagram)

Solar Power (10 points)

18. What is a good definition of solar energy?

19. How does a solar cell make electricity? What is it made of?

20. Name and explain 3 advantages/disadvantages about solar energy to heat or produce electricity compared to using fossil fuels or other alternatives (specifically include environmental issues that can happen.

21. Find an example of solar energy being used in the U.S.?

Answers

An example of solar energy being used in the U.S is in the heating of swimming pools, and powering of cabins in off grid regions.

Hydrogen and Solar Energy

14. Using hydrogen as a fuel source involves using it as a primary energy carrier to power vehicles or generate electricity. It can be combined with oxygen to create water, producing energy in the process. The process of using hydrogen as a fuel source is known as hydrogen fuel cell technology, which involves the conversion of chemical energy into electrical energy.

15. Hydrogen is the most abundant element in the universe but is rarely found in its pure form on Earth. It is usually found in combination with other elements such as oxygen in water, carbon in hydrocarbons, and nitrogen in ammonia. Hydrogen can be extracted from water, natural gas, coal, and biomass through various methods such as steam-methane reforming, electrolysis, and biomass gasification.

16. Advantages of using hydrogen as a fuel source include:

It is a clean energy source that produces no greenhouse gases or air pollutants when burned, emitting only water vapor and heat.It is highly efficient, with a higher energy density than fossil fuels, making it a potent source of energy for transportation and electricity generation.It can be produced from a wide variety of domestic and renewable sources, reducing reliance on imported oil and promoting energy independence.

Disadvantages of using hydrogen as a fuel source include:

It is expensive to produce, store, and transport, making it less cost-effective than fossil fuels and other alternative energies.It requires a lot of energy to produce, mainly from fossil fuels, which defeats the purpose of using it as a clean energy source.The infrastructure for hydrogen fuel cell technology is not yet well established, limiting its widespread adoption and use.

17. A fuel cell is an electrochemical device that converts chemical energy into electrical energy through a chemical reaction between hydrogen and oxygen. It consists of an anode, a cathode, and an electrolyte, with the hydrogen fuel entering the anode and the oxygen entering the cathode. The hydrogen molecules are split into protons and electrons, with the protons passing through the electrolyte and the electrons flowing through an external circuit, generating electricity. The oxygen combines with the protons and electrons at the cathode, producing water as the only byproduct.

18. Solar energy is a form of renewable energy that is derived from the sun's radiation. It is harnessed through various technologies such as photovoltaics, solar thermal systems, and concentrated solar power to generate electricity, heat water, and power homes and businesses.

19. A solar cell is a semiconductor device that converts sunlight directly into electricity through the photovoltaic effect. It is made of a thin layer of a semiconductor material such as silicon that is treated with impurities to create a p-n junction. When sunlight strikes the cell, it creates an electric field that separates the positively charged holes and negatively charged electrons, generating an electric current.

20. Advantages of using solar energy include:

It is a clean and renewable energy source that produces no greenhouse gases or air pollutants when used.It is becoming more cost-effective, with the cost of solar panels decreasing over time and becoming more efficient.It can be installed on rooftops or in remote areas, reducing the need for extensive power lines and infrastructure.

Disadvantages of using solar energy include:

It is dependent on sunlight and may not be available at all times, requiring energy storage or backup systems.It requires large surface areas to generate significant amounts of electricity, making it unsuitable for densely populated urban areas.The production of solar panels requires toxic chemicals and materials that can harm the environment if not disposed of properly.

21. An example of solar energy being used in the U.S is in the heating of swimming pools, and powering of cabins in off grid regions.

Problem 1. What masses of 15% and 20% solutions are needed to prepare 200 g of 17% solution?
Problem 2. What masses of 18% and 5% solutions are needed to prepare 300 g of 7% solution?
Problem 3. 200 g of 15% and 350 g of 20% solutions were mixed. Calculate mass percentage of final solution.
Problem 4. 300 g of 15% solution and 35 g of solute were mixed. Calculate mass percentage of final solution.
Problem 5. 400 g of 25% solution and 150 g of water were mixed. Calculate mass percentage of final solution.

Answers

For each problem:

Masses of solution needed are 80 g and 120 g respectively.Masses of solution needed are 120 g and 180 g respectively.Mass percentage of final solution is 22.7%.Mass percentage of final solution is 23.9%Mass percentage of final solution is 18.2%.

How to calculate mass and mass percentage?

Problem 1:

Let x be the mass of the 15% solution needed and y be the mass of the 20% solution needed.

We have two equations:

x + y = 200 (total mass of the solution)

0.15x + 0.20y = 0.17(200) (total amount of solute in the solution)

Solving these equations:

x = 80 g (mass of 15% solution needed)

y = 120 g (mass of 20% solution needed)

Therefore, 80 g of 15% solution and 120 g of 20% solution need to be mixed to prepare 200 g of 17% solution.

Problem 2:

Let x be the mass of the 18% solution needed and y be the mass of the 5% solution needed.

We have two equations:

x + y = 300 (total mass of the solution)

0.18x + 0.05y = 0.07(300) (total amount of solute in the solution)

Solving these equations:

x = 120 g (mass of 18% solution needed)

y = 180 g (mass of 5% solution needed)

Therefore, 120 g of 18% solution and 180 g of 5% solution need to be mixed to prepare 300 g of 7% solution.

Problem 3:

Let x be the mass of the final solution.

The total amount of solute in the final solution is:

0.15(200 g) + 0.20(350 g) = 55 g + 70 g = 125 g

The total mass of the final solution is:

200 g + 350 g = 550 g

Therefore, the mass percentage of the final solution is:

(125 g / 550 g) x 100% = 22.7%

Problem 4:

Let x be the mass of the final solution.

The total amount of solute in the final solution is:

0.15(300 g) + 35 g = 80 g

The total mass of the final solution is:

300 g + 35 g = 335 g

Therefore, the mass percentage of the final solution is:

(80 g / 335 g) x 100% = 23.9%

Problem 5:

Let x be the mass of the final solution.

The total amount of solute in the final solution is:

0.25(400 g) = 100 g

The total mass of the final solution is:

400 g + 150 g = 550 g

Therefore, the mass percentage of the final solution is:

(100 g / 550 g) x 100% = 18.2%

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Write a balanced chemical equation for the reaction between aqueous hydrogen ion, H+, and aqueous hydroxide ion, OH+

Answers

H+ (aq) + OH- (aq) → H2O (l)

How many liters are in a 6M solution containing 17 moles?

Answers

Answer: There are 102,000,000 liters in the container.

A + B = AB is an example of a ________reaction

Answers

Answer:

   A + B = AB is an example of a synthesis reaction

Explanation:

Effect of Solvent:
Record the results.
H2O =
alcohol =
glycerin =
In which liquid is the salt most soluble?
Using the concept of `'Like dissolves like," explain why you got the results you did.
Explain how the choice of solvent affects the dissolving process.
Effect of Pulverizing:
Record of dissolving times.
crystal =
pulverized =
Why are the dissolving rates different?
Effect of Temperature:
Record of dissolving times.
cold =
hot
Using the concepts of kinetic energy, describe why you found the results you did.
Effect of Stirring:
Record the times necessary to dissolve each sample.
Record of dissolving time.
stirred =
unstirred =
Perform the experiment again using hot tap water this time. Are there any differences in the results between the cold water experiment and the hot water experiment? Explain.
Conclusions:

Review the four factors of dissolving you have just investigated. Given the correct solvent for a solute, what could you do to hasten the solution process?

1.

2.

3.

Answers

To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent.

Effect of Solvent:

H2O = most soluble

alcohol = least soluble

glycerin = intermediate solubility

The salt is most soluble in water because salt is an ionic compound and water is a polar solvent. "Like dissolves like" means that substances with similar polarity and intermolecular forces tend to dissolve each other. Water is a polar solvent, meaning it has a partial positive charge on one end and a partial negative charge on the other, while salt is an ionic compound made up of positively and negatively charged ions. The partial charges on the water molecule can interact with the ions of salt, causing the salt to dissolve.

The choice of solvent affects the dissolving process because it determines the ability of the solvent to interact with the solute. Solvents that are similar in polarity and intermolecular forces to the solute tend to dissolve the solute more easily.

Effect of Pulverizing:

crystal = longest dissolving time

pulverized = shortest dissolving time

The dissolving rates are different because pulverizing the salt increases its surface area, exposing more salt to the solvent and allowing for a greater opportunity for the solute-solvent interactions to occur.

Effect of Temperature:

cold = longest dissolving time

hot = shortest dissolving time

Increasing the temperature of the solvent increases the kinetic energy of the solvent molecules, which leads to more frequent and energetic collisions with the solute particles, resulting in faster dissolving rates.

Effect of Stirring:

stirred = shorter dissolving time

unstirred = longer dissolving time

Stirring increases the rate of the dissolving process by helping to disperse the solute particles evenly throughout the solvent, increasing the surface area of the solute that is in contact with the solvent, and promoting the mixing of the solute and solvent.

Conclusions:

To hasten the solution process, we can choose the correct solvent for the solute, pulverize the solute to increase its surface area, increase the temperature of the solvent, and stir the solution to disperse the solute particles evenly throughout the solvent.

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In an aqueous solution of magnesium bromide, the solute is

Answers

In an aqueous solution of magnesium bromide, the solute is magnesium bromide and the solvent is water.

Aqueous solution of magnesium bromide

The solute in an aqueous solution of magnesium bromide is the solid material, in this case magnesium bromide, dissolved in a liquid, which is the solvent. In this case, the solvent is water. Water is an excellent solvent because of its ability to form hydrogen bonds with other molecules, which allows it to dissolve many different substances.

In addition, it is a polar molecule, meaning that one end of the molecule has a slightly positive charge while the other end has a slightly negative charge. This polarity allows water molecules to interact with molecules of other substances, including magnesium bromide, which is also a polar molecule, allowing it to dissolve in the water.

The interaction between the polar water molecules and the polar magnesium bromide molecules causes the magnesium bromide to break up into its component ions, forming a solution. The ions are then surrounded by water molecules, which keeps them in solution until the solution is evaporated.

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A calorimeter contains 21.0 mL of water at 13.5 ∘C. When 1.70g of X (a substance with a molar mass of 77.0 g/mol) is added, it dissolves via the reaction X(s)+H2O(l)→X(aq) and the temperature of the solution increases to 25.0 ∘C.

Calculate the enthalpy change, ΔH , for this reaction per mole of X.

Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g⋅∘C)], that density of water is 1.00 g/mL, and that no heat is lost to the calorimeter itself, nor to the surroundings.

Express the change in enthalpy in kilojoules per mole to three significant figures.

Answers

Enthalpy change, H, for this reaction per mole of X is thus equal to 0 J/mol.

How can the water's temperature in the calorimeter be determined?

The amount of heat that the calorimeter, q cal, gains may be calculated using the formula qcal = Ccalt, where t is the change in temperature that the mixture experiences.

The equation: can be used to compute the enthalpy change, H.             ΔH = q / n

The heat absorbed by the water can be calculated using the equation:

q1 = m1 x c1 x ΔT1

m1 = 21.0 g = 0.0210 kg (since the density of water is 1.00 g/mL)

c1 = 4.18 J/(g⋅∘C)

ΔT1 = 25.0 ∘C - 13.5 ∘C = 11.5 ∘C

q1 = (0.0210 kg) x (4.18 J/(g⋅∘C)) x (11.5 ∘C) = 1.09 J

The heat absorbed by X can be calculated using the equation:

q2 = m2 x ΔHfus

where m2 is the mass of X and ΔHfus is the enthalpy of fusion of X.

m2 = 1.70 g = 0.00170 kg

ΔHfus = ΔH / n = ΔH / (m2/M)

where M is the molar mass of X.

We can rearrange this equation to solve for ΔH:  ΔH = q2 x (m2/M)

With this assumption, we can calculate ΔH as follows:

ΔH = q / n = (q1 + q2) / n

ΔH  = (1.09 J + q2) / (0.00170 kg / 77.0 g/mol)

ΔH  = (1.09 J + q2) / 0.0000221 mol

The fact that the heat absorbed by X is equal to the heat emitted by the solution can be used to solve for q2:  q2 = -q1

Therefore,  ΔH = (1.09 J - q1) / 0.0000221 mol

Substituting q1, we get:

ΔH = (1.09 J - 1.09 J) / 0.0000221 mol

ΔH = 0 J/mol

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4 Read the sentence from the introduction [paragraph 1].

Matter is capable of undergoing changes, which are classified as either physical or chemical.
Which phrase could BEST replace "is capable of undergoing" in the sentence above?
(A) has the knowledge to perform
(B) has the ability to experience
(C) has the experience to recognize
(D) has the opportunity to facilitate

Answers

Answer: A

Explanation:

You thought i was feeling you that n was a munch

For the following chemical reaction:

In the laboratory, a chemist mixed aqueous barium chloride with aqueous potassium oxide which produced solid barium oxide and aqueous potassium chloride

A. Write the complete balanced chemical equation, including phase labels.

B. Identify the type of reaction that has occurred.

C. Identify the indicator that tells you a chemical reaction has occurred.

Answers

Answer:

A. The complete balanced chemical equation, including phase labels, for the reaction is:

BaCl2 (aq) + K2O (aq) → BaO (s) + 2KCl (aq)

B. The type of reaction that has occurred is a double displacement or metathesis reaction. In this reaction, the barium cations (Ba2+) and potassium anions (K+) exchange partners, resulting in the formation of solid barium oxide (BaO) and aqueous potassium chloride (KCl).

C. The indicator that tells you a chemical reaction has occurred is the formation of a solid precipitate. In this reaction, the solid barium oxide (BaO) that forms is a clear indication that a chemical reaction has occurred. Additionally, the fact that the reactants are aqueous and the products include both a solid and an aqueous solution also indicates a chemical reaction has taken place.

NEED HELP ASAP PLS AND THX PIC IS ATTACHED

Answers

Chlorine have 17 protons, 17 electrons and 18 neutrons.

A bottle of nail polish remover containing ethyl acetate was spilled in an unventilated room measuring 9.00 m × 6.00 m × 3.00 m. After some time had passed, it was determined that 8.701 g of ethyl acetate had evaporated. Calculate the concentration of ethyl acetate in milligrams per cubic meter.

Answers

Answer:

53.69 mg/m³

Explanation:

To calculate the concentration of ethyl acetate in milligrams per cubic meter, we need to know the total volume of the room and the amount of ethyl acetate that evaporated in grams.

The total volume of the room is:

V = l x w x h

V = 9.00 m x 6.00 m x 3.00 m

V = 162.00 cubic meters

To convert the amount of ethyl acetate evaporated from grams to milligrams, we multiply by 1000:

amount of ethyl acetate = 8.701 g = 8,701 mg

Now we can calculate the concentration of ethyl acetate in milligrams per cubic meter:

concentration = amount of ethyl acetate / volume of room

concentration = 8,701 mg / 162.00 cubic meters

concentration = 53.69 mg/m³

Therefore, the concentration of ethyl acetate in the unventilated room is 53.69 mg/m³.

Indicate the type of intermolecular forces hold liquid nitrogen (N2) together?

Answers

Answer:

Nitrogen liquefies at -195.8°C at room temperature.

At -182.95°C, the periodic table equivalent (oxygen) boils.

The boiling point of nitrogen is lower because there are fewer interactions between nitrogen molecules (N2).

The degree of electron fluctuation within a molecule affects interactions between non-polar molecules.

Van der Waals forces are the oldest sort of intermolecular contact, named after Dutch chemist Johannes van der Waals.

The Van der Waals forces, which include dipole-dipole and dispersion forces, are the weakest intermolecular forces.

What is another example, in real life, where we can prove that gases exist even though we can not see them? Explain why you believe this is a good example.

Answers

Well, us human being rely on [tex]o_{2}[/tex] (oxygen). We human beings breathe this in every day because we need it to survive. This is a good example because it explains how humans don't see [tex]o_{2}[/tex] but use it every day.

Which emission spectrum represents the copper?

A.) Spectrum A
B.) Spectrum B
C.) Spectrum C​​

Answers

The emission spectrum of copper can be seen from the spectrum C

What is the emission spectrum?

An emission spectrum is the pattern of wavelengths of electromagnetic radiation emitted by a substance when it is excited by heat, electricity, or some other energy source. Each element, molecule, or compound has a unique emission spectrum, which can be used to identify it or to study its physical and chemical properties.

The emission spectrum is produced when electrons in the atoms or molecules are excited to higher energy levels, and then return to their ground state by releasing energy in the form of photons. The energy of each photon corresponds to a specific wavelength, and the collective emission of all the photons produces a characteristic pattern of bright lines or bands in the electromagnetic spectrum.

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What's the difference between magnesium and Aluminum?​

Answers

the different is that magnesium is 33 percent lighter then aluminum

Answer:

The key difference between aluminum and magnesium is that the aluminum is a corrosion resistant metal whereas magnesium is not. Magnesium and aluminum are two chemical elements that we can categorize as metals in the periodic table. Both are naturally occurring metals in different mineral forms.

Explanation:

What is the total number of moles of reactants and products in the
chemical reaction listed below:
2 H₂S +30₂2 H₂O + 2 SO₂

Answers

The total number of moles of reactants and products in the chemical reaction given is 9 moles

How do i determine the total number of moles?

The total number of mole of reactants and products in the chemical reaction can be obtained as follow:

2H₂S + 3O₂ -> 2H₂O + 2SO₂

The following were obtained from the above equation:

Mole of H₂S = 2 molesMole of O₂ = 3 molesMole of H₂O = 2 molesMole of SO₂ = 2 molesMole of reactants = Mole of (H₂S + O₂) = 2 + 3 = 5 molesMole of products = Mole of (H₂O + SO₂) = 2 + 2 = 4 molesTotal number of moles =?

Total number of mole = Mole of reactants + mole of products

Total number of mole = 5 mole + 4 moles

Total number of mole = 9 moles

Thus, we can say that the total number of mole is 9 moles

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