Reacting masses and percentage composition Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. 2H₂ + O₂ → 2H₂O. What mass of water forms from 2.0 g of hydrogen? (H = 1, O = 16)
- A. 9 g
- B. 36 g
- C. 18 g
- D. 2 g
2. What is the percentage by mass of nitrogen in NH₃? (N = 14, H = 1)
- A. 17.6%
- B. 14%
- C. 50%
- D. 82.4%
3. In a reaction, which reactant is limiting?
- A. The one with the larger mass
- B. The one that is used up first
- C. The one with the larger Mr
- D. The one that is a gas
4. C + O₂ → CO₂. What mass of CO₂ forms from 6.0 g of carbon with excess oxygen? (C = 12, O = 16)
- A. 22 g
- B. 12 g
- C. 44 g
- D. 6 g
5. Fe + S → FeS. There is 0.20 mol Fe and 0.30 mol S. Which statement is correct?
- A. Sulfur is limiting
- B. Iron is limiting and 0.20 mol FeS forms
- C. 0.30 mol FeS forms
- D. Both are used up completely