Questions on Conversions Between Moles and Mass
Multiple-Choice Questions: Conversions Between Moles and Mass
1. What is the mass of 1 mole of water (H₂O)?
A) 10.0 g
B) 16.0 g
C) 18.0 g
D) 20.0 g
E) 2.0 g
2. How many grams are in 2 moles of sodium (Na)? (Na = 23.0 g/mol)
A) 11.5 g
B) 46.0 g
C) 23.0 g
D) 92.0 g
E) 69.0 g
3. How many moles are in 36.0 g of water (H₂O)? (H₂O = 18.0 g/mol)
A) 1 mol
B) 2 mol
C) 3 mol
D) 4 mol
E) 0.5 mol
4. What is the molar mass of carbon dioxide (CO₂)?
A) 28.0 g/mol
B) 44.0 g/mol
C) 32.0 g/mol
D) 40.0 g/mol
E) 12.0 g/mol
5. How many moles are in 88.0 g of CO₂? (CO₂ = 44.0 g/mol)
A) 1 mol
B) 2 mol
C) 3 mol
D) 4 mol
E) 0.5 mol
6. Find the mass of 0.5 mol of nitrogen gas (N₂). (N₂ = 28.0 g/mol)
A) 14.0 g
B) 28.0 g
C) 56.0 g
D) 7.0 g
E) 21.0 g
7. What is the molar mass of NaCl? (Na = 23.0, Cl = 35.5)
A) 58.5 g/mol
B) 46.5 g/mol
C) 35.5 g/mol
D) 23.0 g/mol
E) 80.0 g/mol
8. How many grams are in 3 mol of NaCl?
A) 58.5 g
B) 117.0 g
C) 175.5 g
D) 29.25 g
E) 3.0 g
9. How many moles are in 98.0 g of H₂SO₄? (H = 1.0, S = 32.0, O = 16.0)
A) 1 mol
B) 2 mol
C) 3 mol
D) 0.5 mol
E) 4 mol
10. How many grams are in 4 mol of methane (CH₄)? (C = 12.0, H = 1.0)
A) 16.0 g
B) 64.0 g
C) 44.0 g
D) 32.0 g
E) 28.0 g
11. The molar mass of glucose (C₆H₁₂O₆) is approximately:
A) 180.0 g/mol
B) 160.0 g/mol
C) 120.0 g/mol
D) 150.0 g/mol
E) 100.0 g/mol
12. How many moles are in 90.0 g of glucose (C₆H₁₂O₆)?
A) 0.25 mol
B) 0.5 mol
C) 1 mol
D) 2 mol
E) 3 mol
13. What is the mass of 1.5 mol of O₂? (O₂ = 32.0 g/mol)
A) 48.0 g
B) 32.0 g
C) 64.0 g
D) 16.0 g
E) 96.0 g
14. Which of the following masses contains 1 mole of substance?
A) 24.0 g of Mg
B) 2.0 g of H₂
C) 18.0 g of H₂O
D) All of the above
E) Only A and C
15. How many grams are in 0.25 mol of calcium chloride (CaCl₂)? (Ca = 40.0, Cl = 35.5)
A) 27.9 g
B) 50.0 g
C) 55.5 g
D) 22.2 g
E) 27.75 g
16. How many moles are in 16.0 g of CH₄?
A) 2 mol
B) 1 mol
C) 0.5 mol
D) 4 mol
E) 8 mol
17. What is the mass of 2.5 mol of sulfur (S)? (S = 32.0 g/mol)
A) 64.0 g
B) 80.0 g
C) 96.0 g
D) 100.0 g
E) 120.0 g
18. Which has a mass closest to 1 mole?
A) 44.0 g of CO₂
B) 2.0 g of H₂
C) 58.5 g of NaCl
D) All of the above
E) Only A and C
19. How many grams are in 0.1 mol of ammonia (NH₃)? (N = 14.0, H = 1.0)
A) 1.7 g
B) 10.0 g
C) 17.0 g
D) 0.17 g
E) 1.0 g
20. How many moles are in 4.00 g of helium (He = 4.00 g/mol)?
A) 2 mol
B) 1 mol
C) 0.5 mol
D) 4 mol
E) 0.25 mol
Answers with Explanations
1. C) 18.0 g — H₂O = (2×1.0) + 16.0 = 18.0 g/mol
2. B) 46.0 g — 2 mol × 23.0 g/mol
3. B) 2 mol — 36.0 ÷ 18.0
4. B) 44.0 g/mol — C = 12.0, O₂ = 2×16.0
5. B) 2 mol — 88.0 ÷ 44.0
6. A) 14.0 g — 0.5 mol × 28.0
7. A) 58.5 g/mol — 23.0 + 35.5
8. C) 175.5 g — 3 × 58.5
9. A) 1 mol — H₂SO₄ = 2×1.0 + 32.0 + 4×16.0 = 98.0
10. B) 64.0 g — CH₄ = 16.0 × 4 mol
11. A) 180.0 g/mol — (6×12.0) + (12×1.0) + (6×16.0)
12. B) 0.5 mol — 90.0 ÷ 180.0
13. A) 48.0 g — 1.5 mol × 32.0
14. D) All of the above — All represent 1 mol by mass
15. E) 27.75 g — CaCl₂ = 40.0 + 2×35.5 = 111.0 → 0.25 mol × 111.0
16. B) 1 mol — CH₄ = 16.0 g/mol
17. B) 80.0 g — 2.5 × 32.0
18. D) All of the above — Each value is the molar mass of the compound
19. A) 1.7 g — NH₃ = 17.0 g/mol × 0.1
20. B) 1 mol — 4.00 ÷ 4.00 = 1 mol
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