Questions on Conversions Between Moles and Gas Volume

Multiple-Choice Questions: Conversions Between Moles and Gas Volume

(Use standard conditions: STP = 1 atm, 0°C, where 1 mole of an ideal gas occupies 22.4 L)

1. At STP, how many liters are occupied by 2.00 mol of oxygen gas (O₂)?

A) 11.2 L

B) 22.4 L

C) 33.6 L

D) 44.8 L

E) 56.0 L

2. How many moles of gas are in 44.8 L at STP?

A) 1 mol

B) 2 mol

C) 3 mol

D) 4 mol

E) 5 mol

3. What is the volume of 0.50 mol of nitrogen gas (N₂) at STP?

A) 11.2 L

B) 22.4 L

C) 33.6 L

D) 5.6 L

E) 0.224 L

4. How many moles are in 112.0 L of gas at STP?

A) 2 mol

B) 3 mol

C) 4 mol

D) 5 mol

E) 6 mol

5. Which volume contains 1.5 moles of gas at STP?

A) 22.4 L

B) 33.6 L

C) 11.2 L

D) 44.8 L

E) 18.6 L

6. What is the volume at STP of 0.25 mol of helium gas?

A) 5.6 L

B) 11.2 L

C) 22.4 L

D) 44.8 L

E) 6.8 L

7. If you have 6.72 L of oxygen gas at STP, how many moles do you have?

A) 0.1 mol

B) 0.25 mol

C) 0.3 mol

D) 0.5 mol

E) 0.75 mol

8. At STP, what is the volume of 3.75 mol of argon gas?

A) 22.4 L

B) 33.6 L

C) 56.0 L

D) 84.0 L

E) 10.5 L

9. How many liters are occupied by 5.00 mol of any ideal gas at STP?

A) 112.0 L

B) 22.4 L

C) 44.8 L

D) 11.2 L

E) 56.0 L

10. At STP, how many moles of gas are in 67.2 L?

A) 1 mol

B) 2 mol

C) 3 mol

D) 4 mol

E) 5 mol

11. A gas sample has a volume of 89.6 L at STP. How many moles does it contain?

A) 2 mol

B) 3 mol

C) 4 mol

D) 5 mol

E) 6 mol

12. What volume will 0.75 mol of neon gas occupy at STP?

A) 15.2 L

B) 16.8 L

C) 18.2 L

D) 22.4 L

E) 11.2 L

13. Which of the following equals 2.24 L of gas at STP?

A) 0.1 mol

B) 0.5 mol

C) 1 mol

D) 2 mol

E) 10 mol

14. How many moles are in 33.6 L of carbon dioxide gas at STP?

A) 0.5 mol

B) 1.0 mol

C) 1.5 mol

D) 2.0 mol

E) 2.5 mol

15. What is the STP volume of 1.25 mol of hydrogen gas (H₂)?

A) 25.0 L

B) 28.0 L

C) 30.5 L

D) 21.0 L

E) 22.4 L

16. What volume will 4.50 mol of nitrogen gas occupy at STP?

A) 100.0 L

B) 112.0 L

C) 101.2 L

D) 95.0 L

E) 105.6 L

17. If 0.40 mol of gas occupies a certain volume at STP, what is that volume?

A) 8.96 L

B) 9.88 L

C) 10.56 L

D) 11.2 L

E) 12.5 L

18. How many liters are in 0.05 mol of a gas at STP?

A) 1.12 L

B) 2.24 L

C) 3.50 L

D) 4.48 L

E) 5.00 L

19. Which volume corresponds to 6 mol of an ideal gas at STP?

A) 112.4 L

B) 123.4 L

C) 134.4 L

D) 144.0 L

E) 150.0 L

20. How many moles are in 16.8 L of gas at STP?

A) 0.5 mol

B) 0.6 mol

C) 0.7 mol

D) 0.75 mol

E) 0.8 mol

Questions on Conversions Between Moles and Gas Volume

Answers with Explanations

1. D) 44.8 L

→ 2.00 mol × 22.4 L/mol = 44.8 L

2. B) 2 mol

→ 44.8 L ÷ 22.4 L/mol = 2 mol

3. A) 11.2 L

→ 0.50 mol × 22.4 L/mol = 11.2 L

4. E) 5 mol

→ 112.0 L ÷ 22.4 = 5 mol

5. B) 33.6 L

→ 1.5 mol × 22.4 = 33.6 L

6. A) 5.6 L

→ 0.25 mol × 22.4 = 5.6 L

7. B) 0.3 mol

→ 6.72 ÷ 22.4 = 0.3 mol

8. D) 84.0 L

→ 3.75 × 22.4 = 84.0 L

9. A) 112.0 L

→ 5 × 22.4 = 112.0 L

10. C) 3 mol

→ 67.2 ÷ 22.4 = 3 mol

11. D) 4 mol

→ 89.6 ÷ 22.4 = 4 mol

12. B) 16.8 L

→ 0.75 × 22.4 = 16.8 L

13. A) 0.1 mol

→ 2.24 ÷ 22.4 = 0.1 mol

14. C) 1.5 mol

→ 33.6 ÷ 22.4 = 1.5 mol

15. C) 28.0 L

→ 1.25 × 22.4 = 28.0 L

16. E) 100.8 L

→ 4.5 × 22.4 = 100.8 L

17. C) 8.96 L

→ 0.40 × 22.4 = 8.96 L

18. A) 1.12 L

→ 0.05 × 22.4 = 1.12 L

19. C) 134.4 L

→ 6 × 22.4 = 134.4 L

20. C) 0.75 mol

→ 16.8 ÷ 22.4 = 0.75 mol

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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 Conversions Between Moles and Gas Volume