Caustic soda or lye are two other names for sodium hydroxide. It is a typical ingredient in detergents and cleansers. Sodium hydroxide is a colorless, odorless solid at ambient temperature.
What are sodium hydroxide uses?Lye and caustic soda are other names for sodium hydroxide, a chemical substance with the formula NaOH. It is a whitish, solid ionic substance made up of the cations sodium (Na+) and the anions hydroxide (OH).
At normal atmospheric temps, sodium hydroxide, an extremely corrosive base and alkali, breaks down proteins and can result in serious chemical burns. It easily draws moisture and carbon dioxide from the air due to its high water solubility. It produces a string of NaOH-nH2O hydrates. From water solutions, the monohydrate NaOHH2O crystallizes between 12.3 and 61.8 °C. This monohydrate is frequently the "sodium hydroxide" sold professionally, and it may be used in published statistics instead of the anhydrous substance.
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We know that the specific heat of water c = 1 calorie/g/oC For water, the latent heat of evaporation is 540 calories per gram, and latent heat of melting (or freezing) is 80 calories per gram. Answer the following questions Question 1: How much heat would be required to heat 1 gram of pure liquid water from 10oC to 20oC?
Answer:
10 calories of heat would be required to heat 1 gram of pure liquid water from 10°C to 20°C.
Explanation:
To calculate the heat required to heat 1 gram of pure liquid water from 10°C to 20°C, we need to use the specific heat formula:
Q = m * c * ΔT
where Q is the heat required, m is the mass of the substance, c is the specific heat of the substance, and ΔT is the change in temperature.
In this case, m = 1 gram, c = 1 calorie/g/°C, and ΔT = (20°C - 10°C) = 10°C. Substituting these values into the formula, we get:
Q = 1 gram * 1 calorie/g/°C * 10°C
Q = 10 calories
Therefore, 10 calories of heat would be required to heat 1 gram of pure liquid water from 10°C to 20°C.
Suppose the following two reactions have yields of 82% and 65%, respectively. How many
grams of CH are needed to form 112 g of CH₂Cl₂? Assume there is an excess of Cl₂.
a. CH + Cl₂
→CH,CI + HCI
82% yield
b. CH,CI+ Cl₂CH₂Cl₂ + HCI
-
65% yield
63.4 g of CH is needed to form 112 g of CH₂Cl₂.
What is the purpose of assuming excess Cl₂ in the given reaction?Excess Cl₂ is assumed in the given reaction to ensure that all the CH available is consumed completely in the reaction, and there is no Cl₂ left over.
Let's assume x grams of CH is needed to form 112 g of CH₂Cl₂.
From the balanced equation of the second reaction, we can say that one mole of CH produces one mole of CH₂Cl₂.
Molar mass of CH₂Cl₂ = 12.01 + 2(1.01) + 2(35.45) = 84.93 g/mol
Number of moles of CH₂Cl₂ = 112 g / 84.93 g/mol = 1.318 mol
Since 65% yield is given for the second reaction, the actual amount of CH,CI produced will be 0.65 mol.
From the balanced equation of the first reaction, we can say that one mole of CH reacts with one mole of Cl₂ to produce one mole of CH,CI.
Since 82% yield is given for the first reaction, the actual amount of CH needed will be 0.65 / 0.82 = 0.793 mol.
Now, we can calculate the mass of CH needed as follows:
Mass of CH needed = 0.793 mol x 16.04 g/mol = 12.71 g
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b) The beach in Antibes, France, is composed of small, smooth rocks that have been worn
down by being tumbled against each other by the energy of the sea water
Physical or chemical?
Specific type of physical or chemical:
Answer: A
Explanation: red eye
In order to survive, organisms must maintain stable conditions in their bodies, even though their external environments are always changing.
For example, humans need to maintain an internal temperature around 37°C. Blood needs to have a pH around 7.4 and an oxygen saturation close to 100%.
What needs to happen in order to maintain these conditions?
A.
Organisms must be at rest.
B.
Genes must be altered each time cells replicate.
C.
Organ systems must interact with one another.
D.
all of these
A.Homeostasis Conditions inside of an organ system must remain constant, despite changes to its external environment.An organism is kept alive by numerous chemical processes.
What mechanism does the organism use to keep its surroundings stable?Homeostasis is a self-regulating process that allows an organism to retain internal stability while adapting to shifting external situations. It has emerged as the key unifying idea of physiology.
When are living things capable of maintaining constant internal conditions?The preservation of a steady internal environment is known as homeostasis.The term "homeostasis" was developed to define the chemical and physical conditions that an organism needs maintain in order for its constituent cells, tissues, organs, or organ systems to function correctly.
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Could you guys please help me with this, I really don't have idea how to do?:(
The results of this investigation indicate that the quantity of salt dissolved in water affects how quickly an iron nail rusts.
What are the steps of the investigation of the rusting of nails?The steps of the investigation of the rusting of nails are as follows:
Introduction:
Rusting is a common process in which iron reacts with oxygen and water in the presence of an electrolyte to form hydrated iron (III) oxide, commonly known as rust. In this investigation, we will explore how the amount of salt dissolved in water affects the rusting reaction of an iron nail.
Materials:
Iron nail
Water
Salt
3 small beakers
Stopwatch
Paper towels
Procedure:
Fill each beaker with 50 ml of water.
Dissolve different amounts of salt in each beaker as follows:
Beaker 1: 0 grams of salt
Beaker 2: 5 grams of salt
Beaker 3: 10 grams of salt
Place an iron nail in each beaker.
Record the time and observe the nails every hour for 6 hours.
Record your observations and take photos of the nails at the end of each hour.
At the end of the experiment, dry the nails with paper towels and compare their appearance.
Observations:
Beaker 1: No visible rust on the nail throughout the experiment.
Beaker 2: A small amount of rust appeared on the nail after 2 hours. The rust increased over time and covered about 25% of the nail surface after 6 hours.
Beaker 3: A significant amount of rust appeared on the nail after 1 hour. The rust increased rapidly and covered about 80% of the nail surface after 6 hours.
Conclusion:
The results of this investigation suggest that the rusting reaction of an iron nail depends on the amount of salt dissolved in water. When no salt was added to the water, no visible rust appeared on the nail. However, when salt was added, rust appeared on the nail. The amount of rust increased with the amount of salt added, indicating that the rusting reaction is accelerated in the presence of an electrolyte such as salt. This is because the presence of ions in the solution helps to conduct electricity, which facilitates the transfer of electrons between the iron and oxygen molecules, thus accelerating the rusting process.
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An unknown element X has the following isotopes: ⁵²X (90.00% abundant, atomic mass = 52.04 amu), ⁴⁹X (8.00% abundant, atomic mass = 48.99 amu), and ⁵⁰X (2.00% abundant, atomic mass = 50.09 amu). What is the average atomic mass of X in amu?
An unknown element X has the following isotopes: ⁵²X (90.00% abundant, atomic mass = 52.04 amu), ⁴⁹X (8.00% abundant, atomic mass = 48.99 amu), and ⁵⁰X (2.00% abundant, atomic mass = 50.09 amu). The average atomic mass of X is 51.72 amu.
What are isotopes?Isotopes are variations of chemical elements that have a varied number of neutrons but the same number of protons and electrons. In other words, isotopes are different forms of the same element that have different amounts of nucleons (the sum of protons and neutrons) because of variations in the total number of neutrons in each of their individual nuclei.
For instance, the carbon isotopes carbon-14, carbon-13, and carbon-12 all exist. A total of 8 neutrons are present in carbon-14, 7 neutrons are present in carbon-13, and 6 neutrons are present in carbon-12.
Using the formula:
Average atomic mass=∑[tex]\frac{abundance}{100}[/tex]× Atomic mass
Substituting the values,
Average atomic mass = 51.72 amu
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40.532 g of an unknown compound X is dissolved in 351.11 mL. What is the molarity of X? Here is some information to determine the identity of X. When 1.00g of X is dissolved in water and allowed to react wtih AgNO3, all the chlorine in X precipitates and 1.95g of AgCl is collected. When 1.00g of X undergoes complete combustion, 0.900 g of CO2 and 0.735 g of H2O were collected. The empirical and molecular formula are identical. Compound X only contains carbon, hydrogen, nitrogen, and chlorine.
A client has a product that reads 75mls per serving. The client consumes 180 mls of the product which reads per serving 13.5g carbs, 10g protein, and 4g fat. How much energy has the client consumed.
Answer:
To calculate the energy consumed by the client, we need to use the following formula:
Energy (in calories) = (grams of carbohydrate x 4) + (grams of protein x 4) + (grams of fat x 9)
First, let's calculate the amount of each nutrient in the 180ml serving:
Carbohydrates: (75 ml / serving) x (13.5 g / 75 ml) x 180 ml = 32.4 g
Protein: (75 ml / serving) x (10 g / 75 ml) x 180 ml = 24 g
Fat: (75 ml / serving) x (4 g / 75 ml) x 180 ml = 9.6 g
Now we can calculate the energy consumed:
Energy = (32.4 g x 4) + (24 g x 4) + (9.6 g x 9) = 129.6 + 96 + 86.4 = 312 calories
Therefore, the client has consumed 312 calories from the 180 ml serving of the product.
The chemical process in which small organic molecules called monomers bond together to form a chain is called __________.
Answer:
polymerization
Explanation:
any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer.
2.11 A 1.0-g sample of carbon dioxide (CO2) is fully decomposed into its elements, yielding 0.273 g of carbon and 0.727 g of oxygen. (a) What is the ratio of the mass of O to C? (b) If a sample of a different compound decomposes into 0.429 g of carbon and 0.571 g of oxygen, what is its ratio of the mass of O to C? (c) According to Dalton's atomic theory, what is the empirical formula of the second compound?
The mole ratio of carbon to oxygen is therefore 1:1, which means that the empirical formula of the second compound is CO.
What is Dalton's atomic theory?According to Dalton's atomic theory, the empirical formula of a compound gives the smallest whole-number ratio of atoms in the compound. To determine the empirical formula of the second compound, we need to calculate the mole ratio of carbon to oxygen using the masses given in the problem.
The moles of carbon can be calculated as:
moles of C = 0.429 g / 12.01 g/mol = 0.0357 mol
The moles of oxygen can be calculated as:
moles of O = 0.571 g / 16.00 g/mol = 0.0357 mol
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HELP PLSSS
the screenshot is attached. it has it all there
The balanced chemical equation for the reaction is
Cl2 + 2HO → 2HCl + O2
What is reaction ?
Reaction is a response to a situation or stimulus. It can be physical, mental, or emotional, and can range from subtle to extreme. It is a way to cope with the environment and is an important part of survival. Reactions can be conscious or unconscious and can be reflexive or voluntary. They can also be positive or negative, depending on the situation. Reactions vary depending on the individual, their experiences and their circumstances. Learning to recognize, understand, and control reactions can help people navigate challenging situations
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. What is the relative rate of effusion of Ar compared to Cl₂?
Answer:
Ar effuses 1.37 times faster than Cl₂
Explanation:
The relative rate of effusion of two gases is given by the inverse ratio of the square root of their molar masses.
The molar mass of Ar is 39.95 g/mol
The molar mass of Cl₂ is 70.91 g/mol.
Therefore, the relative rate of effusion of Ar compared to Cl₂ can be calculated as follows:
Sqrt is the square root
sqrt(70.91)/sqrt(39.95) = 1.37
So, Ar effuses 1.37 times faster than Cl₂.
What is barium bromide and chromium (II) sulfate net ionic equation. With the solubility signs.
Answer:
NET equation: 2Br^- (aq) + Cr2+ (aq) → CrBr2 (aq)
The solubility signs for each compound are:
Barium bromide (BaBr2): (aq) - aqueous (soluble)
Chromium (II) sulfate (CrSO4): (aq) - aqueous (slightly soluble)
Barium sulfate (BaSO4): (s) - solid (insoluble)
Chromium (II) bromide (CrBr2): (aq) - aqueous (soluble)
Explanation:
Barium bromide and chromium (II) sulfate are both ionic compounds that can dissociate into their constituent ions in aqueous solutions. To write the net ionic equation for the reaction between barium bromide and chromium (II) sulfate, we first need to determine the state of the reactants and products (whether they are soluble or insoluble in water) using solubility rules.
Barium bromide (BaBr2) is soluble in water, while chromium (II) sulfate (CrSO4) is slightly soluble. When the two are mixed in water, a double displacement reaction takes place, producing barium sulfate (BaSO4) and chromium (II) bromide (CrBr2) as the products:
BaBr2 (aq) + CrSO4 (aq) → BaSO4 (s) + CrBr2 (aq)
To write the net ionic equation, we need to eliminate any spectator ions that do not participate in the reaction. In this case, the barium and sulfate ions are spectator ions, as they appear unchanged on both sides of the equation. The net ionic equation is therefore:
2Br^- (aq) + Cr2+ (aq) → CrBr2 (aq)
where Br^- and Cr2+ are the ions that actually participate in the reaction.
The solubility signs for each compound are:
Barium bromide (BaBr2): (aq) - aqueous (soluble)
Chromium (II) sulfate (CrSO4): (aq) - aqueous (slightly soluble)
Barium sulfate (BaSO4): (s) - solid (insoluble)
Chromium (II) bromide (CrBr2): (aq) - aqueous (soluble)
Question 4:
1. Suppose a 70-kg individual drinks 2 L/day of water containing 0.1
mg/L of 1,1-dichloroethylene for 20 years.
(a) Find the hazard quotient for this exposure.
(b) Find the cancer risk.
(c) If the individual drinks this water for 30 years instead of just 20,
recompute the hazard quotient and the cancer risk.
(a) The hazard quotient is:
HQ = Intake / RfD = 0.0002 mg/day / 0.02 mg/kg/day = 0.01
(b) The cancer risk is 1 in 10,000.
(c) The cancer risk is 1 in 1,000.
What is Hazard quotient?Hazard quotient (HQ) is a measure used in risk assessment to evaluate the potential health risk posed by exposure to a chemical or other hazard. It is calculated as the ratio of the dose or exposure level of the chemical to a reference dose (RfD) or reference concentration (RfC) established by regulatory agencies or scientific bodies as a safe level of exposure. If the hazard quotient is greater than 1, it suggests that the level of exposure is of potential concern and additional risk assessment may be needed.
(a) The hazard quotient (HQ) is calculated as the daily intake of a chemical divided by its reference dose (RfD). The RfD for 1,1-dichloroethylene is 0.02 mg/kg/day.
The daily intake of 1,1-dichloroethylene can be calculated as:
Intake = concentration × ingestion rate × body weight
Intake = 0.1 μg/L × 2 L/day × 70 kg = 14 μg/day = 0.0002 mg/day
The hazard quotient is:
HQ = Intake / RfD = 0.0002 mg/day / 0.02 mg/kg/day = 0.01
(b) The cancer risk from exposure to 1,1-dichloroethylene can be estimated using the unit risk factor (URF) for this chemical, which is 0.5 per mg/kg/day. The cancer risk is calculated as:
Risk = Intake × URF = 0.0002 mg/day × 0.5 per mg/kg/day = 0.0001
Therefore, the cancer risk is 1 in 10,000.
(c) If the individual drinks this water for 30 years, the total exposure would be:
Exposure = Intake × 365 days/year × 30 years = 2.19 mg
The new hazard quotient is:
HQ = Exposure / (RfD × body weight) = 2.19 mg / (0.02 mg/kg/day × 70 kg) = 1.57
The new cancer risk is:
Risk = Exposure × URF = 2.19 mg × 0.5 per mg/kg/day = 1.10
Therefore, the cancer risk is 1 in 1,000.
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Speculate on how this effect of K+ on NCC action could simultaneously prevent hyperkalemia (from the high dietary K+ intake) AND promote increased Na+ excretion, leading to modulation of blood pressure.
Answer:
When there is a high dietary intake of potassium (K+), there is a higher concentration of K+ in the extracellular fluid (ECF) which causes the cell membrane to depolarize. This could lead to hyperkalemia, which is a serious condition that can lead to cardiac arrhythmia, muscle weakness, and even death.
The Na-Cl cotransporter (NCC) plays a key role in the regulation of blood pressure by reabsorbing Na+ in the distal tubules of the kidneys. The NCC is regulated by the renin-angiotensin-aldosterone system (RAAS) and aldosterone increases reabsorption of Na+ through the NCC.
However, a high K+ intake can inhibit the actions of the RAAS, reducing aldosterone secretion and, therefore, reducing the reabsorption of Na+ through the NCC. This leads to increased Na+ excretion in the urine, which helps decrease blood pressure.
In addition, the increased excretion of Na+ will further limit any potential increases in serum potassium concentrations, reducing the chances of developing hyperkalemia. Therefore, the effect of K+ on NCC can simultaneously prevent hyperkalemia and promote increased Na+ excretion, leading to modulation of blood pressure.
Given the made up equation
2X + 3Y --> 8Z
If we need to make 23.3 moles of Z, how many moles of Y would we need to start with?
According to the fictitious equation, 8.74 moles of Y would be required to initiate the reaction if we needed to produce 23.3 moles of Z.
How many moles of Y are there, exactly?The balanced chemical equation states that 2 moles of X and 3 moles of Y combine to create 8 moles of Z. In other words, 3 moles Y / 8 moles Z = x moles Y / 23.3 moles Z indicates that the mole ratio of Y to Z is 3:8.
where x is the required number of moles of Y.
Y = 3 moles * 23.
8 moles Z times x moles Y equals 3 moles Z.
69.9 = 8x
x = 8.74
As a result, 8.74 moles of Y would be required to make 23.3 moles of Z.
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In the previous steps, you determined:
pre-1982 pennies contribute 1.24 g to the
overall mass
post-1982 pennies contribute 1.50 g to
the overall mass
The overall weighted average mass comes
from combining the mass contributions
from each type of penny. Add the masses
from the previous steps together to get the
overall weighted average mass.
Weighted Average -
Pre-1982 Contribution + Post-1982
Contribution
What is the weighted average mass of a
penny from this sample?
Enter
Answer:
2.74
Explanation:
Okay, let's go through the previous steps:
Pre-1982 pennies contribute 1.24 g to the overall mass
Post-1982 pennies contribute 1.50 g to the overall mass
To calculate the weighted average mass, I'll add these contributions together:
Pre-1982 contribution: 1.24 g
Post-1982 contribution: 1.50 g
Total weighted average mass = 1.24 g + 1.50 g = 2.74 g
Why are mass and volume extensive properties and why is density an intensive property?
Answer: Density is an intensive property because there is a narrow range of densities across the samples. No matter what the initial mass was, densities were essentially the same. Since intensive properties do not depend on the amount of material, the data indicate that density is an intensive property of matter.
Density is an intensive property of matter that illustrates how much mass a substance has in a given amount of volume.
10. For the reaction
H₂(g) + O₂(g) → H₂O(l)
H=-286 kJ/mol
What is the enthalpy change when 10.4 mol of hydrogen gas reacts with excess oxygen?
a. 27.5 kJ
b.-27.5 kJ
c. 3.64 x 10-2 J
d. -2.97 × 10³ J
e. -1.48 x 10³ J
Answer this correctly please
Answer:a. 2Hg(NO3)2(s) → 2Hg(l) + 2NO2(g) + O2(g)
b. Ca3(PO4)2(aq) + 2H3PO4(aq) → 3Ca(H2PO4)2(aq)
c. 3NaOH(aq) + FeCl3(aq) → Fe(OH)3(aq) + 3NaCl(aq)
Explanation:
What is the molar mass of argon gas (AN = 18)?
Answer:
molar mass = 79.90 g/mol
Explanation:
Argon as a gas is Ar₂. Molar mass, as found on a standard IUPAC Periodic table, located on most high school chemistry and physics textbooks, as well as data sheets in examinations, is 2×39.95 = 79.90 g/mol.
Which slow carbon reservoir is being turned into a fast carbon reservoir by humans?
oxidation of 3-methyl-2-pentanol
Spell out the full name of the compound.
The product of oxidation of 3-methyl-2-pentanol is 3-methyl-pentan-2-one.
The oxidation of alcohol produces aldehyde and ketones.
What is oxidation of alcohol?Alcohols are a class of substances that have one, two, or more hydroxyl (-OH) groups bonded to the single alkane bond. These substances all have the generic formula R-OH. They play a crucial role in organic chemistry since they can be altered or transformed into other chemicals, including aldehydes and ketones, among others. There are two distinct sorts of alcohol reactions. These reactions have the ability to break the R-O bond or even the O-H bond.
The oxidation process transforms the alcohols into aldehydes and ketones. One of the most significant reactions in the study of organic chemistry is this one.
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urea, chemical formula (NH2)2CO, is used for fertilizer and many other things. calculate the number of N, C, O, and H atoms in 1.78*10^4g of urea.
Which statement about fossil fuels is true?
_____________________________________
(any wrong/spams answers will be reported)
_____________________________________
(A) They are found deep within the earth.
(B) They do not cause pollution.
(C) They are renewable.
Explanation:
• they are found deep within earth
Answer:
A
Explanation:
fossil fuels are remains of dead plants and animals. so, they are found underground
4Na + O2 → 2Na2O
How many moles of sodium oxide, Na2O, are produced when oxygen gas and 17.0 moles of sodium react?
When oxygen gas and 17.0 moles of sodium combine, 8.50 moles of Na2O are created.
What is mole?The unit of measurement known as a mole (mol) is used to represent the quantity of a substance. The amount of a substance that has the same number of particles (atoms, molecules, or ions) as there are in 12 grams of carbon-12 is referred to as a mole. This number, which is roughly 6.022 x 1023, is referred to as Avogadro's number.
How do you determine it?For the interaction between sodium and oxygen to form sodium oxide, the balanced chemical equation is:
4Na + O2 → 2Na2O
We can deduce from the equation that when 4 moles of sodium combine with 1 mole of oxygen, 2 moles of sodium oxide are created.
So, we must use stoichiometry to calculate how many moles of Na2O are created when 17.0 moles of Na react:
17.0 moles of Na × (1 mole of O2/ 4 moles of Na) × (2 moles of Na2O / 1 mole of O2) = 8.50 moles of Na2O
Consequently, when oxygen gas and 17.0 moles of sodium combine, 8.50 moles of Na2O are created.
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a chemist titrates 190 ml of .2412 nitrous acid solution with .377 M KOH solution. Calculate the ph at equivalence. The pKa of nitrous acid is 3.35
Therefore, the pH at equivalence is 5.27 as a chemist titrates 190 ml of .2412 nitrous acid solution with .377 M KOH solution.
What is titration?Titration is a laboratory technique used to determine the concentration of a solution (the analyte) by reacting it with a solution of known concentration (the titrant). This is typically done by slowly adding the titrant to the analyte until the reaction is complete, which can be determined by a change in color, pH, or other measurable property. The point at which the reaction is complete is called the equivalence point, and it corresponds to the stoichiometrically equivalent amounts of the analyte and titrant.
Here,
Nitrous acid (HNO2) is a weak acid, so we can use the Henderson-Hasselbalch equation to calculate the pH at equivalence:
pH = pKa + log([A-]/[HA])
where pKa is the acid dissociation constant, [A-] is the concentration of the conjugate base (NO2-), and [HA] is the concentration of the acid (HNO2).
At equivalence, the moles of acid will be equal to the moles of base. We can use this relationship to calculate the concentration of HNO2:
moles of HNO2 = (volume of HNO2 solution) x (concentration of HNO2 solution)
moles of KOH = (volume of KOH solution) x (concentration of KOH solution)
Since the stoichiometric ratio of KOH to HNO2 is 1:1, the moles of HNO2 will be equal to the moles of KOH at equivalence.
moles of HNO2 = moles of KOH
(volume of HNO2 solution) x (concentration of HNO2 solution) = (volume of KOH solution) x (concentration of KOH solution)
We can rearrange this equation to solve for the concentration of HNO2:
concentration of HNO2 = [(volume of KOH solution) x (concentration of KOH solution)] / (volume of HNO2 solution)
Now we can substitute this value into the Henderson-Hasselbalch equation:
pH = pKa + log([A-]/[HA])
pH = 3.35 + log([0.377 M]/[concentration of HNO2])
Plugging in the values, we get:
concentration of HNO2 = (190 ml) x (0.2412 M) / 1000 ml = 0.04581 moles/L
pH = 3.35 + log([0.377 M]/[0.04581 M])
pH = 5.27
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Based on the first table, can someone answer these questions in the second image?
a).017 moles of copper will react with 4 x 0.017 = 0.068 moles of HNO3.
B) As excess HNO3 is 0.019mol, so for this reaction 0.019 mol/2 = 0.0095 mol of Na2CO3 will be required.
What uses does copper have?Due to its ductility and excellent conductivity, copper is primarily used in electrical generators, home and auto wiring, and the wires in electronics like radios, TVs, computers, lights, and motors.
Mass of copper = 1.07 g
Molar mass of copper = 63.55 g / mol
Moles of copper = mass/ molar mass = 1.07g/ 63.55g/mol = 0.017 mol
Vol of HNO3 = 5.5 ml
Concentration of HNO3 = 15.8 M
Moles of HNO3 = vol x concentration = (5.5/1000)L x 15.8 mol/L = 0.087 mol
(Since concentration is given in moles/L the volume also needs to be converted to liters. 5.5ml = 5.5/1000 L)
Based on the balanced chemical equation, 4 moles of HNO3 will react with 1 mole of copper to give 1 mole of copper nitrate.
So 0.017 moles of copper will react with 4 x 0.017 = 0.068 moles of HNO3.
Excess moles of HNO3 = moles of HNO3 added - moles of HNO3 reacted = 0.087mol- 0.068mol = 0.019 mol
On addition of Na2CO3 following reactions will occur
2) 2HNO3 + Na2CO3 ----------> 2NaNO3 + CO2 + H2O
This is the reaction that will take place between sodium carbonate and excess nitric acid. 2 moles of HNO3 will react with 1 mole of Na2CO3. As excess HNO3 is 0.019mol, so for this reaction 0.019 mol/2 = 0.0095 mol of Na2CO3 will be required.
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How many moles of mg are present in 2.5 x10^25 atoms mg
The number of moles of the magnesium that is involved is 42 moles
How do we use moles to find the number of atoms?To find the number of atoms using moles, we need to use Avogadro's number, which is the number of particles (atoms, molecules, ions, etc.) in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23 particles per mole.
The formula to find the number of atoms using moles is:
Number of atoms = number of moles x Avogadro's number
We know that;
1 mole would contain 6.02 * 10^23 atoms
x moles will contain 2.5 x10^25 atoms
x = 42 moles
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Which of the following terms would best classify of pure sodium chloride
An example of a substance with a set proportion of elements that are chemically linked together to form a single entity is sodium chloride. These substances are referred to as compounds.
Why is NaCl entirely an ion?The reason why NaCl is powerful and highly ionic by nature is due to the electrostatic force contained within the free ions. The fact that NaCl may conduct electricity while it is molten is another compelling argument for classifying it as an ion.
Why doesn't pure dry NaCl conduct?There are no free ions in solid NaCl because the ions are bound in their lattice structure places, but the ions can move freely in liquid or molten form, which allows them to conduct electricity.
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The given question is incomplete. The complete question is:
Which of the following terms would best classify a sample of pure sodium chloride?
A) An element
B) A highly reactive metal
C) A poisonous gas
D) A compound