R2.1 How much? The amount of chemical change Quiz
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5 questions, one answer each
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1. What mass of water forms when 4.00 g of hydrogen burns completely? (2H₂ + O₂ → 2H₂O; M: H₂ 2.02, H₂O 18.02)
- A. 18.0 g
- B. 35.7 g
- C. 71.4 g
- D. 4.00 g
2. What amount of NaOH is in 20.0 cm³ of 0.500 mol dm⁻³ solution?
- A. 10.0 mol
- B. 0.0100 mol
- C. 0.0250 mol
- D. 0.100 mol
3. 2Al + 3Cl₂ → 2AlCl₃. With 2.0 mol Al and 2.0 mol Cl₂, which is limiting?
- A. Al
- B. Cl₂
- C. Neither
- D. Both
4. Theoretical yield 5.00 g, experimental yield 4.10 g. Percentage yield?
- A. 82.0%
- B. 122%
- C. 4.10%
- D. 18.0%
5. Atom economy for CaCO₃ → CaO + CO₂ when CaO is the desired product? (M: CaCO₃ 100.09, CaO 56.08)
- A. 44.0%
- B. 56.0%
- C. 100%
- D. 178%