Question 1

What is the minimum mass of water necessary to produce 200.g of sulfuric acid in the following reaction?
2SO2 + O2 + 2H2O $\rarr$2H2SO4

Accepted Answer

Question 2

Calculate the number of moles of xenon in 12.0 g of xenon.

Accepted Answer

A) 1.00 mol 
B) 0.0457 mol 
C) 0.183 mol 
D) 7.62 * 10-3 mol 
E) 0.0914 mol 
A) 1.00 mol 
B) 0.0457 mol 
C) 0.183 mol 
D) 7.62 * 10-3 mol 
E) 0.0914 mol

Question 3

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction:
NH4NO3 $\rarr$ N2O + 2H2O
If a 108 g sample of NH4NO3 decomposes to give 23 g of N2O(g), what percent of the original sample remains?

Accepted Answer

Question 4

A compound with a percent composition by mass of 87.5% N and 12.5% H was recently discovered.What is the empirical formula for this compound?

Accepted Answer

The answer of A compound with a percent composition by...

Question 5

How many grams of nitrogen are there in 7.5 g of Ca(NO3)2?

Accepted Answer

A) 0.64 g 
B) 1.3 g 
C) 0.15 g 
D) 1.15 g 
E) 2.3 g 
A) 0.64 g 
B) 1.3 g 
C) 0.15 g 
D) 1.15 g 
E) 2.3 g

Question 6

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 mole of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l)$\rarr$ 2V(l)+ 5CaO(s)

Accepted Answer

A) 1.0 mol 
B) 1.6 mol 
C) 2.0 mol 
D) 0.80 mol 
E) None of these 
A) 1.0 mol 
B) 1.6 mol 
C) 2.0 mol 
D) 0.80 mol 
E) None of these

Question 7

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 $\rarr$ __ CO2 + __ H2O

Accepted Answer

A) 1 
B) 8 
C) 9 
D) 26 
E) 27 
A) 1 
B) 8 
C) 9 
D) 26 
E) 27

Question 8

Determine the number of moles of aluminum in 96.7 g of Al.

Accepted Answer

A) 0.279 mol 
B) 3.58 mol 
C) 7.43 mol 
D) 4.21 mol 
E) 6.02 * 1023 mol 
A) 0.279 mol 
B) 3.58 mol 
C) 7.43 mol 
D) 4.21 mol 
E) 6.02 * 1023 mol

Question 9

Liquid heptane, C7H16, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 25.5 mL of heptane? (density of heptane = 0.6838 g/mL)

Accepted Answer

A) 8.14 g 
B) 89.6 g 
C) 61.3 g 
D) 30.6 g 
E) 5.57 g 
A) 8.14 g 
B) 89.6 g 
C) 61.3 g 
D) 30.6 g 
E) 5.57 g

Question 10

An oxyhydrocarbon produced in a chemical reaction was determined to have a molecular mass of 120.20 g/mol.Which of the following is a possible empirical formula for this compound?

Accepted Answer

A) CH4O 
B) C2H6O 
C) C3H8O 
D) C3H8O2 
E) C4H10O2 
A) CH4O 
B) C2H6O 
C) C3H8O 
D) C3H8O2 
E) C4H10O2

Question 11

Balance the following chemical equation:
P4O10 + H2O $\rarr$H3PO4

Accepted Answer

Question 12

If 0.66 mole of a substance has a mass of 99 g, what is the molecular mass of the substance?

Accepted Answer

The answer of If 0.66 mole of a substance has...

Question 13

How many molecules are there in 8.0 g of ozone, O3?

Accepted Answer

A) 3 molecules 
B) 3.6 * 1024 molecules 
C) 1.0 * 1023 molecules 
D) 3.0 * 1023 molecules 
E) 6.0 * 1023 molecules 
A) 3 molecules 
B) 3.6 * 1024 molecules 
C) 1.0 * 1023 molecules 
D) 3.0 * 1023 molecules 
E) 6.0 * 1023 molecules

Question 14

What is the mass of 3.00 moles of ethanol, C2H6O?

Accepted Answer

A) 4.99 * 10-24 g 
B) 138 g 
C) 6.52 * 10-2 g 
D) 50 g 
E) 1.81 * 1024 g 
A) 4.99 * 10-24 g 
B) 138 g 
C) 6.52 * 10-2 g 
D) 50 g 
E) 1.81 * 1024 g

Question 15

How many moles of NH3 are there in 77.5 g of NH3?

Accepted Answer

A) 0.220 mol 
B) 4.55 mol 
C) 14.0 mol 
D) 1.31 * 103 mol 
E) None of the above. 
A) 0.220 mol 
B) 4.55 mol 
C) 14.0 mol 
D) 1.31 * 103 mol 
E) None of the above.

Question 16

How many sulfur atoms are present in 25.6 g of Al2(S2O3)3?

Accepted Answer

A) 0.393 
B) 6 
C) 3.95 * 1022 
D) 7.90 * 1022 
E) 2.37 * 1023 
A) 0.393 
B) 6 
C) 3.95 * 1022 
D) 7.90 * 1022 
E) 2.37 * 1023

Question 17

The Hall process for the production of aluminum involves the reaction of aluminum oxide with elemental carbon to give aluminum metal and carbon monoxide. If the yield of this reaction is 75%, what mass of aluminum metal can be produced from the reaction of 1.65 * 106 of aluminum oxide with 1.50 * 106 g of carbon?

Accepted Answer

A) 1.6 * 105 g 
B) 3.3 * 105 g 
C) 6.6 * 105 g 
D) 8.7 * 105 g 
E) 1.7 *106 g 
A) 1.6 * 105 g 
B) 3.3 * 105 g 
C) 6.6 * 105 g 
D) 8.7 * 105 g 
E) 1.7 *106 g

Question 18

When balanced with smallest set of whole numbers, the coefficient of O2 in the following equation is __ C2H4 + __ O2 $\rarr$ __ CO2 + __ H2O

Accepted Answer

A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 6. 
A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 6.

Question 19

How many atoms are in 5.54 g of F2?

Accepted Answer

A) 6.02 * 1023 atoms 
B) 0.146 atoms 
C) 0.292 atoms 
D) 8.78 * 1022 atoms 
E) 1.76 * 1023 atoms 
A) 6.02 * 1023 atoms 
B) 0.146 atoms 
C) 0.292 atoms 
D) 8.78 * 1022 atoms 
E) 1.76 * 1023 atoms

Question 20

Phosgene, a poisonous gas used during WWI, is composed of 12.1% C, 16.2% O, and 71.1% Cl.What is the empirical formula of phosgene?

Accepted Answer

The answer of Phosgene, a poisonous gas used during WWI,...

Exam 3: Mass Relationships in Chemical Reactions

What is the minimum mass of water necessary to produce 200.g of sulfuric acid in the following reaction? 2SO2 + O2 + 2H2O →\rarr→ 2H2SO4

Calculate the number of moles of xenon in 12.0 g of xenon.

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction: NH4NO3 →\rarr→ N2O + 2H2O If a 108 g sample of NH4NO3 decomposes to give 23 g of N2O(g), what percent of the original sample remains?

A compound with a percent composition by mass of 87.5% N and 12.5% H was recently discovered.What is the empirical formula for this compound?

How many grams of nitrogen are there in 7.5 g of Ca(NO3)2?

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 mole of calcium based on the following chemical reaction? V2O5(s)+ 5Ca(l) →\rarr→ 2V(l)+ 5CaO(s)

What is the coefficient preceding O2 when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? __ C18H36O2 + __ O2 →\rarr→ __ CO2 + __ H2O

Determine the number of moles of aluminum in 96.7 g of Al.

Liquid heptane, C7H16, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 25.5 mL of heptane? (density of heptane = 0.6838 g/mL)

An oxyhydrocarbon produced in a chemical reaction was determined to have a molecular mass of 120.20 g/mol.Which of the following is a possible empirical formula for this compound?

Balance the following chemical equation: P4O10 + H2O →\rarr→ H3PO4

If 0.66 mole of a substance has a mass of 99 g, what is the molecular mass of the substance?

How many molecules are there in 8.0 g of ozone, O3?

What is the mass of 3.00 moles of ethanol, C2H6O?

How many moles of NH3 are there in 77.5 g of NH3?

How many sulfur atoms are present in 25.6 g of Al2(S2O3)3?

When balanced with smallest set of whole numbers, the coefficient of O2 in the following equation is __ C2H4 + __ O2 →\rarr→ __ CO2 + __ H2O

How many atoms are in 5.54 g of F2?

Phosgene, a poisonous gas used during WWI, is composed of 12.1% C, 16.2% O, and 71.1% Cl.What is the empirical formula of phosgene?

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What is the minimum mass of water necessary to produce 200.g of sulfuric acid in the following reaction? 2SO₂ + O₂ + 2H₂O $\rarr$ 2H₂SO₄

Ammonium nitrate decomposes to give dinitrogen monoxide and water as shown in the following reaction: NH₄NO₃ $\rarr$ N₂O + 2H₂O If a 108 g sample of NH₄NO₃ decomposes to give 23 g of N₂O(g), what percent of the original sample remains?

How many grams of nitrogen are there in 7.5 g of Ca(NO₃)₂?

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V₂O₅ with 4.0 mole of calcium based on the following chemical reaction? V₂O₅(s)+ 5Ca(l) $\rarr$ 2V(l)+ 5CaO(s)

What is the coefficient preceding O₂ when the following combustion reaction of a fatty acid is properly balanced using the smallest set of whole numbers? C₁₈H₃₆O₂ + O₂ $\rarr$ CO₂ + H₂O

Liquid heptane, C₇H₁₆, burns in oxygen gas to yield carbon dioxide and water. What is the minimum mass of oxygen required for the complete reaction of 25.5 mL of heptane? (density of heptane = 0.6838 g/mL)

Balance the following chemical equation: P₄O₁₀ + H₂O $\rarr$ H₃PO₄

How many molecules are there in 8.0 g of ozone, O₃?

What is the mass of 3.00 moles of ethanol, C₂H₆O?

How many moles of NH₃ are there in 77.5 g of NH₃?

How many sulfur atoms are present in 25.6 g of Al₂(S₂O₃)₃?

When balanced with smallest set of whole numbers, the coefficient of O₂ in the following equation is C₂H₄ + O₂ $\rarr$ CO₂ + H₂O

How many atoms are in 5.54 g of F₂?