Where energy from the sun is enough to break the bonds between water molecules in the ice and convert them directly into water vapor without passing through the liquid phase.
What is Sublimation?
Sublimation is a physical process in which a solid substance is transformed directly into a gas without passing through the liquid phase. In other words, sublimation occurs when a solid substance changes its state directly to a vapor state, bypassing the liquid state.
Sublimation occurs when the vapor pressure of a solid exceeds the atmospheric pressure, causing the solid to transform into a gas without melting. This process requires energy to break the intermolecular bonds holding the solid together. This energy is typically supplied through heating or a decrease in pressure.
Water in Earth's polar regions can produce water vapor even when the temperature is very low due to a process called sublimation. Sublimation is a phase transition from a solid directly to a gas, without passing through the liquid phase. This process occurs when the vapor pressure of the solid (in this case, ice) exceeds the atmospheric pressure.
In the polar regions, the air is very cold and dry, with low atmospheric pressure. When the sun shines on the ice or snow, it provides energy that causes the surface layer of the ice to evaporate directly into water vapor without melting into liquid water.
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What do all types of electromagnetic radiation have in common? Choose more than one answer.
Answer:
1)
Stream of photons
2)Energy in atoms
3)Speed of 300,000 kilometers per second
4)Travel through vacuum of space
Explanation:
The various forms of electromagnetic radiation share the following traits:
flow of photons
The power of atoms
300,000 kilometres per second in speed
traverse the void of space
Hence, the appropriate responses are:
Stream of photons
Energy in atoms
Speed of 300,000 kilometers per second
Travel through vacuum of space
A 9.03 g sample of unknown alkali metal chloride, MCI , is dissolved into 55.00 g of water. the freezing point of the solution is "-10.45" C. Calculate the molar mass of the solute
__ g/mol
(should be 3 significant digits)
A 9.03 g sample of unknown alkali metal chloride, MCI , is dissolved into 55.00 g of water. the freezing point of the solution is "-10.45" C. Calculate the molar mass of the solute74.1 g/mol .
What is water ?Water is a chemical compound made up of two hydrogen atoms and one oxygen atom (H2O). It is a natural compound that is essential for all known forms of life. Water is a tasteless, odorless, and colorless liquid at standard temperature and pressure. It is a very good solvent, making it a key component of many biochemical processes. Water is also the only common substance that exists on Earth in all three states of matter (solid, liquid, and gas).
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Which of the following is one of the main reasons that the use of synthetic opiates is growing?
O A.
OB.
O C.
O D.
Because more Americans are depressed, and opiates are the best way to combat depression.
Because synthetic opiates such as fentanyl are getting stronger, which means they are more addictive.
Because there is an abundance of poppies in Asia that need to be harvested into natural opiates.
Because more and more synthetic opiates are becoming legal in states across America.
One of the primary reasons that the usage of synthetic opiates is increasing is because they are becoming more addictive as they become stronger, like fentanyl.
Which of the following is an opioid analgesic made artificially?Fentanyl is a synthetic opioid that is used pharmaceutically to treat severe pain, usually the agony associated with advanced cancer. It has between 50 and 100 times the potency of morphine.
What are the opioids' typical side effects?In addition to feeling comfortable and content, those who take prescription opioids may also endure sleepiness, disorientation, nausea, constipation, and decreased respiration. Opioids on prescription produce effects comparable to those of heroin.
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How many milliliters of a 0. 8 M solution of citric acid would be needed to react with 15 grams of baking soda? Please show work
74.4 mL of a 0.8 M solution of the citric acid would be needed to react with 15 grams of the baking soda.
The balanced chemical equation for the reaction between citric acid (H₃C₆H₅O₇) and baking soda (NaHCO₃) is:
H₃C₆H₅O₇ + 3 NaHCO₃ → Na₃C₆H₅O₇ + 3 CO₂ + 3 H₂O
From the balanced equation, we can see that one mole of citric acid (H₃C₆H₅O₇) reacts with three moles of baking soda (NaHCO₃). We can use this relationship to determine the amount of citric acid required to react with 15 grams of baking soda.
Calculate the number of moles of the baking soda
The molar mass of baking soda (NaHCO₃) is:
23.00 g/mol (Na) + 1.01 g/mol (H) + 12.01 g/mol (C) + 3x16.00 g/mol (O) = 84.01 g/mol
The number of moles of baking soda (NaHCO₃) present in 15 grams can be calculated as:
15 g / 84.01 g/mol = 0.1785 mol
Calculate the number of moles of citric acid required
From the balanced chemical equation, we know that 1 mole of citric acid reacts with 3 moles of baking soda. Therefore, the number of moles of citric acid required is:
0.1785 mol / 3 = 0.0595 mol
Calculate the volume of 0.8 M citric acid required
The concentration of citric acid is given as 0.8 M, which means that there are 0.8 moles of citric acid per liter of solution. We can use this information to calculate the volume of citric acid required:
0.0595 mol / 0.8 mol/L = 0.0744 L
= 74.4 mL
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What is the molarity of a solution that contains 1.45 moles of a solute in 750.0 mL of solution?
Answer: 1.93 M
Explanation:
Molarity is Moles / Liters
1.45/0.75 L
Which of the following is the most likely scientific explanation for why so many people report improvement after wearing this jewelry?
Some people may be experiencing the placebo effect, which is the best scientific explanation for why many people report improvement after wearing a particular piece of jewelry.
Option A is correct.
The placebo effect: what is it?A positive health outcome caused by a person's expectation that an intervention will help is known as the placebo effect. A positive response to a patient's treatment may also be triggered by the way a doctor or nurse interacts with them.
How does the brain respond to the placebo effect?As a result, "placebo effects" are positive brain-body responses to context information. Nocebo effects occur when brain responses to context information promote disease, distress, and pain instead.
Question incomplete:
Which of the following is the most likely scientific explanation for why so many people report improvement after wearing this jewelry
A. Some people may be experiencing the placebo effect
B. Some people will say whatever the company pays them to say
C. The ions in the jewelry change the electric field around the body, improving blood flow
D. The ions in the jewelry improve energy flow through the body
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Please Answer this question.
The number of mole of P₂O₃ required for the reaction is 0.25 mole
How do i determine the number of mole of P₂O₃ required?We shall begin by obtaining the mole in 41 g of H₃PO₃. Details below:
Mass of H₃PO₃ = 41 grams Molar mass of H₃PO₃ = 82 g/mol Mole of H₃PO₃ =?Mole = mass / molar mass
Mole of H₃PO₃ = 41 / 82
Mole of H₃PO₃ = 0.5 mole
Finally, we shall determine the number of mole of P₂O₃ required. Details below:
P₂O₃ + 3H₂O -> 2H₃PO₃
From the balanced equation above,
2 moles of H₃PO₃ were obtained from 1 mole of P₂O₃
Therefore,
0.5 mole of H₃PO₃ will be obtain from = 0.5 / 2 = 0.25 mole of P₂O₃
Thus, the number of mole of P₂O₃ required is 0.25 mole
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14. 87 moles of Magnesium should form 14. 87 moles of Magnesium Chloride. 14. 77 moles of Hydrochloric acid should form 7. 97 moles of Magnesium Chloride. Only 1. 78 moles of Magnesium chloride is obtained. What is the percent yield?
PLEASE HELP and teach please
The Percent yield is 11.99%
The amount of magnesium chloride that can be produced from 4.87 moles of magnesium is:
4.87 moles Mg x (1 mole MgCl2 / 1 mole Mg) = 4.87 moles MgCl2
The amount of magnesium chloride that can be produced from 14.77 moles of hydrochloric acid is:
14.77 moles HCl x (1 mole MgCl2 / 2 moles HCl) = 7.385 moles MgCl2
The percent yield is calculated as follows:
percent yield = (actual yield / theoretical yield) x 100%
percent yield = (1.78 moles / 4.87 moles) x 100% = 36.54%
Therefore, the percent yield of the reaction is 36.54%, which is approximately equal to 11.99 when rounded to two significant figures.
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There are three stable atoms of Argon (Atomic Number 18): Argon-36, Argon-38 and
Argon-40. What would the atoms of these isotopes have in common? What would
be different about their atoms? (4 points)
HELP ASAP
On the periodic table, argon has an average atomic weight of 39.948 amu. This number is really near 40. This suggests that Ar-40 is the isotope of argon (Ar) that is most prevalent in the natural world.
What characteristics do argon-36, argon-38, and argon-40 share?If all three argon atoms are neutral, they would each contain 18 protons and 18 electrons. In comparison to one another, the three isotopes will each have a distinct number of neutrons (18, 20, and 22 neutrons respectively).
Why is potassium a 39 positioned before argon, atomic number 40, in the current periodic table?Atomic number, not atomic mass, is used to categorise the elements. As the atomic number of argon (18) is less than that of potassium (19)
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what is ore????????????
Ore is a metal-bearing mineral or rock, or a native metal, that can be mined for profit.
A solution is prepared from 80 grams of acetic acid (CH3COOH) and 725 grams of water. What is the molality of this solution?
Answer: 1.84
Explanation:
molality is moles / Kg
convert 80 grams to moles = 80 / 60=1.33 moles
kg=0.725
1.33/0.725 = 1.84 molality acetic acid
How much energy does the water in this
experiment absorb according to the
calorimeter data?
Calorimeter Data
Mass (g)
50.0
Specific heat (J/g°C) 4.18
20.5
32.5
T (U/C)
T, (J/g °C)
ано = [ ?] J
Heat Absorbed (J)
Enter
Answer:
2508 Joules
Explanation:
See the attached worksheet.
The equation for heat transfer is: q = mcΔT,
where q is energy, m is mass, c is the specific heat of the substance, and ΔT is the temperature change (T2 - Ti). The specifric heat is a property of a substance that tells us how much energy it akes to raise a mass of that substance by 1 degree. The untis of q can vary wildly, since there are many difference units measureing the same thing. Heat is ofter in Jould (metric), but could also be measured in nuntis such as ergs. Mass may be grams, kgrams, or other units, Temperatures may be K, C, or even F. All are valid, but the units must all match within the calculation. In this case we are given units of grams, °C, and Joules.
q = mcΔT
q = (50g)*(4.18 J/g°C)*(32.5°C-20.5°C)
q = 2508 J
(b) Draw a dot and cross diagram to show the formation of calcium oxide from atoms of
[2]
calcium and oxygen.
When calcium and oxygen interact, calcium oxide is created. Calcium oxide has the chemical formula CaO. The oxygen anion O2- and calcium cation Ca2+ form an ionic bond to form the molecule.
Which chemical is created when an O2 ion and a Ca2+ ion combine?As a result, the interaction between Ca2+ and O2 results in the ionic molecule calcium oxide. The chemical name is CaO.
How is calcium oxide produced from calcium?In a lime kiln, calcium carbonate (CaCO3; mineral calcite)-containing materials like limestone or seashells can be thermally decomposed to create calcium oxide. Calcination is the name of the method used to manufacture burnt lime.
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At STP, 6.5 moles of nitrogen gas, N2 , occupy a volume of 145 liters. How many moles of nitrogen gas, N2 , occupy a volume of 179 liters at STP?
All the elements in this group form ions with a positive ___ charge. _____ is the most reactive element in the group.
All the elements in this group form ions with a positive oxidation charge Fluorine is the most reactive element in the group.
What is oxidation?Oxidation is a chemical process that involves the transfer of electrons from one element to another. This process occurs when an atom or molecule loses one or more electrons, resulting in a more positive charge. The element or molecule that has lost electrons is said to be oxidized, while the element or molecule that gains electrons is said to be reduced. Oxidation can also refer to the process of gaining oxygen, as when iron rusts or when organic matter is burned. Oxidation is a key component of many chemical reactions, such as photosynthesis and respiration, and is essential for life on Earth.
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A reaction conducted in a calorimeter consumed 0.038mol of an unknown substance. The temperature of the 109g of water was increased from 13.2 to 25.7. What is the enthalpy of this reaction in kJ/mol?
The enthalpy change of the reaction is 148.4 kJ/mol. When a chemical reaction occurs at constant pressure, the change in enthalpy, denoted by ΔH, represents the heat absorbed or released by the reaction.
What is Enthalpy ?
Enthalpy is a thermodynamic property of a system that reflects the heat content of the system at constant pressure. It is denoted by the symbol H and has units of joules (J) or kilojoules (kJ). Enthalpy is a state function, which means that it depends only on the initial and final states of a system, and not on the path taken to reach those states.
To calculate the enthalpy change (ΔH) of the reaction in kJ/mol, we need to use the equation:
ΔH = q / n
where q is the heat absorbed or released by the reaction, n is the amount of substance in moles that underwent the reaction, and ΔH is the enthalpy change in kJ/mol.
We can start by calculating the heat absorbed or released by the reaction using the heat capacity of water and the change in temperature of the water:
q = m × C × ΔT
where m is the mass of water, C is the specific heat capacity of water (4.184 J/g°C), and ΔT is the change in temperature of the water.
Substituting the given values, we get:
q = (109 g) × (4.184 J/g°C) × (25.7°C - 13.2°C) = 5619.9 J
We can convert this to kilojoules (kJ) by dividing by 1000:
q = 5.62 kJ
Next, we need to determine the amount of substance in moles that underwent the reaction. From the given information, we know that 0.038 mol of the unknown substance was consumed.
Finally, we can calculate the enthalpy change of the reaction using the formula:
ΔH = q / n = (5.62 kJ) / (0.038 mol) = 148.4 kJ/mol
Therefore, the enthalpy change of the reaction is 148.4 kJ/mol.
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This is the writing prompt
The Case of the Sunken Treasure
Scientific Background:
After a decade of searching, a group of explorers finds the remains of the USS Minnow on the bottom of the ocean floor. Reportedly the ship went down in a storm at sea with a waterproof treasure trove of jewelry estimated to be worth millions of dollars. The treasure hunters have hired your scientific firm to determine the identity of the metal jewelry. Your team received 10.0 g of the metal jewelry and reacted the samples with sulfuric acid (H2O4) to determine its identity.
Writing Task:
Construct an explanation that identifies the jewelry found as either very expensive jewelry made from Aluminum(Al or imitation jewelry made from
Iron(Fe).
In your essay, be certain to:
* Identify and discuss the four different types of chemical reactions. Justify the kind of reaction present in your reaction of the metal and sulfuric acid.
* Show how to calculate the amount of product, iron (III) sulfate, produced from 10.0 grams of iron. Show how to calculate the amount of product, aluminum sulfate, produced from 10.0 grams of aluminum.
* Discuss what scientists can expect to see during the reaction. Identify the unknown metal and explain how they determined the identity of the jewelry. (Documents A through D are related to this Writing Task.)
Based on the scientific background provided, the jewelry found could potentially be made of either aluminum or iron. In order to determine the identity of the metal, a sample of the jewelry was reacted with sulfuric acid (H2SO4) to observe the resulting chemical reaction.
There are four different types of chemical reactions: synthesis reactions, decomposition reactions, single displacement reactions, and double displacement reactions. The reaction between the metal jewelry and sulfuric acid is a single displacement reaction, also known as a redox reaction. This is because the reaction involves the transfer of electrons from the metal to the hydrogen in the sulfuric acid.
The chemical equation for the reaction between the metal and sulfuric acid is:
Metal + H2SO4 → Metal sulfate + H2
If the metal is iron, the product produced is iron (III) sulfate (Fe2(SO4)3) and hydrogen gas (H2). If the metal is aluminum, the product produced is aluminum sulfate (Al2(SO4)3) and hydrogen gas (H2).
To calculate the amount of product produced, we need to use stoichiometry. Assuming the metal is iron, the molar mass of iron is 55.85 g/mol and the molar mass of iron (III) sulfate is 399.88 g/mol. Therefore, the theoretical yield of iron (III) sulfate from 10.0 g of iron is:
10.0 g Fe × (1 mol Fe / 55.85 g Fe) × (1 mol Fe2(SO4)3 / 2 mol Fe) × (399.88 g Fe2(SO4)3 / 1 mol Fe2(SO4)3) = 357.67 g Fe2(SO4)3
Similarly, if the metal is aluminum, the molar mass of aluminum is 26.98 g/mol and the molar mass of aluminum sulfate is 342.15 g/mol. Therefore, the theoretical yield of aluminum sulfate from 10.0 g of aluminum is:
10.0 g Al × (1 mol Al / 26.98 g Al) × (1 mol Al2(SO4)3 / 2 mol Al) × (342.15 g Al2(SO4)3 / 1 mol Al2(SO4)3) = 634.97 g Al2(SO4)3
During the reaction, scientists can expect to see bubbling as hydrogen gas is produced. They can also observe the color and texture of the metal before and after the reaction to help determine its identity. Once the product of the reaction is identified as either iron (III) sulfate or aluminum sulfate, the identity of the metal can be determined.
In conclusion, the reaction between the metal jewelry and sulfuric acid is a single displacement reaction. Assuming the metal is iron, the product produced is iron (III) sulfate, and if the metal is aluminum, the product produced is aluminum sulfate. Using stoichiometry, the theoretical yield of each product can be calculated. Scientists can observe the reaction and the resulting product to determine the identity of the metal.
Identify the element whose ion can exist as 2+ or 4+
Answer:
Palladium (Pl), Platinum (Pt), or Lead (Pb)
Explanation:
Palladium, Platinum, and Lead have possible charges of +2 and +4.
Determine the volume of hydrogen gas needed to make 8L of water vapor?
Calculate how much hydrogen gas is required to produce 8 L of water vapour. (14.0 mol)(8.31 LkPa/mol mol K) (321 K). V: = 67.9 L 550 kPa 24.
What volume of water contains one litre of hydrogen gas?111/0.0899 = 1235 litres of hydrogen and 888.81/1.429 = 622 litres of oxygen are produced from one litre of water. Avogadro's law states that the volume of hydrogen is roughly double that of oxygen.
How do you calculate the hydrogen gas volume?Given that one mole of dihydrogen (H2) weighs 2,0159 g/mol, the experimental density of hydrogen—which is 0,0899 g/L at 0 °C and 0,0837 g/L at 20 °C—can be used to compute the exact molar volume of hydrogen.
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1)Many common things you use regularly are colloids except.....
* milk
*hair
*spray
*paint
*alloy
2)Which mixture exhibits the Tyndall effect?
*fog
*salt water
*gasoline
*sterling silver
3)In an apparatus for testing the conductivity of solutions:
The light bulb
* glows in the solution is a poor conductor.
*dim if the solution is a poor conductor.
*doesn't glow at all.
*glows as it's nonelectrolyte.
The mixture that exhibits the Tyndall effect is fog. The Tyndall effect is the scattering of light by particles in a medium.
What is Tyndall Effect?
The Tyndall effect is the scattering of light by particles in a medium. When a light beam passes through a medium with particles that are larger than the wavelength of the light, the light is scattered in different directions, making the beam visible. This effect is observed in mixtures such as fog, smoke, and dust.
The Tyndall effect is named after the British physicist John Tyndall, who first observed and explained this phenomenon in 1869. Tyndall discovered that when a beam of light passes through a transparent medium that contains particles such as dust, smoke, or fog, the light is scattered by these particles in different directions. This causes the beam of light to become visible, especially when viewed from the side.
Salt water and gasoline are homogeneous mixtures, which means that the particles are evenly distributed and do not scatter light. Sterling silver is a metallic alloy, which also does not exhibit the Tyndall effect as its particles are too small and uniformly distributed in the metal matrix. Therefore, the correct answer is fog.
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How many moles of NHO, will be produced when 0.51 mol of N₂O5
reacts according to the following equation? N₂O + H₂O → 2HNO3
(1.0 mol HNO3)
0.51 moles of N₂O₅ will produce 0.51 moles of N₂O.
What is Moles?
n chemistry, a mole is a unit of measurement that is used to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains the same number of particles as there are atoms in exactly 12 grams of carbon-12. This number, known as Avogadro's number.
The balanced equation for the reaction is:
N₂O₅ + H₂O → 2 HNO₃
From the equation, we see that 1 mole of N₂O₅ reacts to produce 2 moles of HNO₃. Therefore, we can use stoichiometry to calculate the number of moles of HNO₃ produced from 0.51 moles of N₂O₅:
0.51 mol N₂O₅ x (2 mol HNO₃ / 1 mol N₂O₅) = 1.02 mol HNO₃
So, 0.51 moles of N₂O₅ produces 1.02 moles of HNO₃.
Since 2 moles of HNO₃ are produced for every 1 mole of N₂O₅, we can use the same conversion factor to determine the number of moles of N₂O that would be produced:
1.02 mol HNO₃ x (1 mol N₂O / 2 mol HNO₃) = 0.51 mol N₂O
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3. Which is not true about natural
selection?
The statement that is not true of natural selection is: Natural selection controls evolution by maintaining the features that individuals acquire over their lifetimes. So, option C is correct.
Natural selection does not directly affect features acquired throughout an individual's lifespan; rather, it affects traits that are already existing in the gene pool of a population. Natural selection is the process through which individuals with particular heritable qualities experience differential survival and reproduction, changing the frequencies of those traits within a population over time. Natural selection favors features that offer an advantage in the current environment, resulting in their preservation and increased frequency while eliminating those that are unfavorable.
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The complete question is:
Which of the following is not true of natural selection?
a) Natural selection strives to preserve beneficial qualities while eliminating harmful ones.
b) The next generation will consist more heavily of descendants of people who have improved environmental adaptation.
c) Natural selection controls evolution by maintaining the features that individuals acquire over their lifetimes.
d) Genetic diversity in a population is affected by natural selection; it results through mutation.
Determine the celsius temperature of 1. 50 moles of ammonia contained in a 10. 0-l vessel under a
pressure of 2. 0 atm.
a
-1100
162
-50 c
с
0. 0 c
the Celsius temperature of 1.50 moles of ammonia contained in a 10.0 L vessel under a pressure of 2.0 atm is approximately -56.15 C. The closest answer choice to this value is -50 C.
To determine the Celsius temperature of 1.50 moles of ammonia contained in a 10.0 L vessel under a pressure of 2.0 atm, we can use the Ideal Gas Law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
T = PV/nR
T = (2.0 atm) x (10.0 L) / (1.50 moles x 0.08206 L atm/K mol)
T = 217 K
To convert this temperature to Celsius, we can simply subtract 273.15 K:
T(Celsius) = 217 K - 273.15
T(Celsius) = -56.15 C
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Pasos a seguir para realizar la nomenclatura común y la nomenclatura IUPAC
Both the common nomenclature and the IUPAC nomenclature are used to name chemical compounds. Common nomenclature: Determine the type of chemical compound. IUPAC nomenclature: Determine the type of chemical substance.
Common nomenclature refers to the use of common or traditional names to describe chemical compounds, while IUPAC (International Union of Pure and Applied Chemistry) nomenclature is a standardized system of naming chemical compounds based on their chemical structure and properties.
Common nomenclature may vary from country to country or from one language to another, and it often uses names that describe the origin, properties, or uses of a compound, or the name of the discoverer or the person who first synthesized it. For example, the common name for acetylsalicylic acid is aspirin.
In contrast, IUPAC nomenclature provides a systematic and unambiguous way of naming chemical compounds based on their molecular structure and functional groups. The rules for IUPAC nomenclature are designed to give each compound a unique name that reflects its composition and structure. For example, the IUPAC name for acetylsalicylic acid is 2-acetoxybenzoic acid.
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How many moles of NaOH are there in 1.00 liters of a 2.7M NaOH solution?
Answer:
2.7mol
Explanation:
Concentration = amount of substance (n)/Volume
n = C × V
n = 2.7M × 1L
n = 2.7mol
How many nitrogen atoms are in NH3?
Answer: 1 nitrogen atom
2. Discuss how the researchers study the decomposition process
what volume of a concentrated hcl solution, which is 36.0 % hcl by mass and has a density of 1.179 g/ml , should be used to make 11.10 l of an hcl solution with a ph of 1.70?
The volume of concentrated HCl solution needed to make 11.10 L of an HCl solution with a pH of 1.70 is 9.41 mL.
To calculate the volume of a concentrated HCl solution that should be used to make 11.10 L of an HCl solution with a pH of 1.70, the following steps should be followed:
Step 1: Determine the molarity of HCl in the final solutionThe pH of the solution is given as 1.70. This means that the concentration of H3O+ ions in the solution is 0.020 M (since pH + pOH = 14 and pOH = 14 - pH = 14 - 1.70 = 12.30; [H3O+] = 10-pH).
Since HCl is a strong acid and is completely ionized in solution, the concentration of HCl in the solution will also be 0.020 M.
Step 2: Calculate the number of moles of HCl needed to make 11.10 L of a 0.020 M HCl solution, the number of moles of HCl needed can be calculated as follows:moles = M x V = (0.020 M) x (11.10 L) = 0.222 mol
Step 3: Determine the mass of HCl needed to calculate the mass of HCl needed, we need to use the molarity and density of the concentrated HCl solution. Since the solution is 36.0% HCl by mass, this means that it contains 36.0 g HCl per 100 g of solution.
Therefore, the mass of HCl in 1 L of the solution is: mass of HCl = (36.0 g HCl / 100 g solution) x (1000 mL / 1 L) x (1 L) = 360 g HCl/L.
The molarity of the solution can be calculated as follows:M = moles / volume (L)M = moles / (mass / density)M = (0.222 mol) / (mass / density)0.020 M = (0.222 mol) / (mass/density)mass / density = (0.222 mol) / (0.020 M)mass / density = 11.10 gmass = 11.10 g x (1 mL / 1.179 g) = 9.41 mL
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How many moles are in 65 grams of helium (He)
Answer: 16.25
Explanation:
The molar mass of helium (He) is approximately 4 g/mol.
To calculate the number of moles in 65 grams of helium, we need to divide the given mass by the molar mass:
Number of moles = mass ÷ molar mass
Number of moles = 65 g ÷ 4 g/mol
Number of moles = 16.25 mol
Therefore, there are 16.25 moles of helium in 65 grams of helium.
Step 2: Show the conversions required to solve this problem and calculate the grams of Ni.
54.3 g Ni₂0, x
Incorrect
grams of Ni:
Incorrect
165.38 g Ni₂0,
1 mole 0₂
Answer Bank
1 mole Ni₂0,
3 moles O₂
58.69 g Ni
2 moles Ni₂0,
1 mole Ni
= g Ni
32.00 g 0₂
4 moles Ni
& Ni
Answer:
To solve this problem and calculate the grams of Ni, we need to use the molar mass of Ni₂0₃ and the stoichiometry of the reaction.
The balanced chemical equation for the reaction between Ni₂0₃ and H₂ is:
Ni₂0₃ + 2H₂ → 2Ni + 3H₂0
From this equation, we can see that 1 mole of Ni₂0₃ reacts to produce 2 moles of Ni. Therefore, we can use the following conversion factor:
1 mole Ni₂0₃ = 2 moles Ni
We can also use the molar mass of Ni₂0₃ to convert grams of Ni₂0₃ to moles of Ni₂0₃:
54.3 g Ni₂0₃ x (1 mole Ni₂0₃ / 165.38 g Ni₂0₃) = 0.3284 moles Ni₂0₃
Now, we can use the conversion factor to find moles of Ni:
0.3284 moles Ni₂0₃ x (2 moles Ni / 1 mole Ni₂0₃) = 0.6568 moles Ni
Finally, we can use the molar mass of Ni to convert moles of Ni to grams of Ni:
0.6568 moles Ni x (58.69 g Ni / 1 mole Ni) = 38.53 g Ni
Therefore, the grams of Ni in 54.3 g Ni₂0₃ is 38.53 g Ni.
Explanation: