Questions on Volume-Volume Stoichiometry

Volume-Volume Stoichiometry – Multiple-Choice Questions

Assume all gases are measured at the same temperature and pressure, so volumes are directly proportional to moles.

1. In the reaction N₂ + 3H₂ → 2NH₃, how many liters of H₂ are needed to react with 5 L of N₂?

A) 3 L

B) 5 L

C) 10 L

D) 15 L

E) 20 L

**2. How many liters of CO₂ are produced when 4 L of CH₄ are burned?

CH₄ + 2O₂ → CO₂ + 2H₂O**

A) 1 L

B) 2 L

C) 4 L

D) 8 L

E) 0.5 L

**3. If 6 L of O₂ react completely with hydrogen gas, how many liters of H₂ are required?

2H₂ + O₂ → 2H₂O**

A) 6 L

B) 2 L

C) 4 L

D) 12 L

E) 3 L

4. In: 2CO + O₂ → 2CO₂, how many liters of CO₂ are formed from 10 L of CO?

A) 5 L

B) 10 L

C) 20 L

D) 15 L

E) 8 L

**5. What is the ratio of volumes of reactants in the equation:

2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O?**

A) 2:5

B) 4:2

C) 5:2

D) 1:1

E) 2:2

**6. How many liters of H₂O are produced from 3 L of O₂?

2H₂ + O₂ → 2H₂O**

A) 2 L

B) 3 L

C) 4 L

D) 6 L

E) 1.5 L

**7. What volume of HCl is required to react with 5 L of NH₃?

NH₃ + HCl → NH₄Cl**

A) 2.5 L

B) 5 L

C) 10 L

D) 1 L

E) 15 L

8. For: N₂ + O₂ → 2NO, how many liters of NO are formed from 4 L of N₂?

A) 2 L

B) 4 L

C) 6 L

D) 8 L

E) 1 L

9. In: 2H₂S + 3O₂ → 2SO₂ + 2H₂O, how many liters of SO₂ are produced from 6 L of H₂S?

A) 3 L

B) 4 L

C) 6 L

D) 2 L

E) 9 L

10. In: 3H₂ + N₂ → 2NH₃, how many liters of NH₃ are produced from 9 L of H₂?

A) 3 L

B) 4 L

C) 6 L

D) 9 L

E) 12 L

**11. How many liters of O₂ are required to react with 7.5 L of C₃H₈?

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O**

A) 15 L

B) 25 L

C) 37.5 L

D) 7.5 L

E) 12.5 L

12. In: 2NO₂ → 2NO + O₂, what volume of NO is produced from 4 L of NO₂?

A) 1 L

B) 2 L

C) 4 L

D) 6 L

E) 8 L

13. In: 4NH₃ + 3O₂ → 2N₂ + 6H₂O, how many liters of O₂ are needed to react with 8 L of NH₃?

A) 6 L

B) 4 L

C) 3 L

D) 5 L

E) 12 L

14. In: 2SO₂ + O₂ → 2SO₃, what volume of SO₃ is formed from 10 L of O₂?

A) 20 L

B) 10 L

C) 5 L

D) 15 L

E) 2 L

15. In: C₂H₄ + 3O₂ → 2CO₂ + 2H₂O, how many liters of CO₂ are formed from 2 L of C₂H₄?

A) 2 L

B) 3 L

C) 4 L

D) 6 L

E) 1 L

**16. If 12 L of CO₂ are produced, how many liters of C₂H₆ were burned?

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O**

A) 2 L

B) 3 L

C) 4 L

D) 6 L

E) 12 L

17. In: 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O, how many liters of CO₂ are produced from 2 L of C₂H₂?

A) 1 L

B) 2 L

C) 3 L

D) 4 L

E) 5 L

18. In: H₂ + Cl₂ → 2HCl, what volume of Cl₂ is needed to react with 8 L of H₂?

A) 8 L

B) 4 L

C) 16 L

D) 2 L

E) 12 L

19. In: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O, how many liters of O₂ are required for 4 L of butane (C₄H₁₀)?

A) 13 L

B) 20 L

C) 26 L

D) 6.5 L

E) 8 L

**20. How many liters of NH₃ are produced from 6 L of N₂?

N₂ + 3H₂ → 2NH₃**

A) 2 L

B) 3 L

C) 4 L

D) 6 L

E) 12 L

Questions on Volume-Volume Stoichiometry

Answers and Explanations

1. D – 1 N₂ : 3 H₂ → 5 L N₂ × (3 L H₂ / 1 L N₂) = 15 L

2. C – 1 CH₄ : 1 CO₂ → 4 L CH₄ → 4 L CO₂

3. A – 1 O₂ : 2 H₂ → 6 L O₂ × (2 / 1) = 12 L

4. B – 2 CO → 2 CO₂, so 10 L CO = 10 L CO₂

5. A – Reactant ratio is 2:5 (C₂H₂:O₂)

6. D – 1 O₂ → 2 H₂O, so 3 L O₂ = 6 L H₂O

7. B – 1 NH₃ : 1 HCl, so 5 L = 5 L

8. D – 1 N₂ → 2 NO → 4 L N₂ = 8 L NO

9. C – 2 H₂S → 2 SO₂ → 6 L = 6 L

10. C – 3 H₂ : 2 NH₃ → 9 L H₂ → 6 L NH₃

11. C – 1 C₃H₈ : 5 O₂ → 7.5 × 5 = 37.5 L

12. C – 2 NO₂ → 2 NO → 4 L → 4 L NO

13. A – 4 NH₃ : 3 O₂ → 8 L NH₃ → 6 L O₂

14. A – 1 O₂ → 2 SO₃ → 10 L O₂ = 20 L

15. C – 1 C₂H₄ : 2 CO₂ → 2 L C₂H₄ = 4 L CO₂

16. B – 2 C₂H₆ → 4 CO₂ → 12 L CO₂ = 12 × (2 / 4) = 6 L / 2 = 3 L

17. D – 2 C₂H₂ → 4 CO₂ → 2 L = 4 L

18. A – 1 H₂ : 1 Cl₂ → 8 L H₂ = 8 L Cl₂

19. C – 2 C₄H₁₀ : 13 O₂ → 4 L × (13 / 2) = 26 L

20. E – 1 N₂ → 2 NH₃ → 6 L = 12 L

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Ronaldo Silva: Professor and Specialist in Science Teaching, from UFF/RJ, with more than 25 years of experience in teaching.

Questions on Volume-Volume Stoichiometry