Chemistry · May / June 2020 · Paper 12 · Question 15

A mixture of 5 cm³ of CH₄ and 100 cm³ of air is exploded. Assume air is 80% N₂ by volume and 20% O₂ by volume. The resulting mixture is cooled. All volumes are measured at room temperature and pressure. CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) What is the composition of the resulting gas?

1. A5 cm³ of CO₂ ✓, 10 cm³ of O₂ ✓, 80 cm³ of N₂ ✓, 10 cm³ of steam ✓
2. B5 cm³ of CO₂ ✓, 10 cm³ of O₂ ✓, 80 cm³ of N₂ ✓, 10 cm³ of steam ✗
3. C5 cm³ of CO₂ ✓, 10 cm³ of O₂ ✗, 80 cm³ of N₂ ✓, 10 cm³ of steam ✓
4. D5 cm³ of CO₂ ✓, 10 cm³ of O₂ ✗, 80 cm³ of N₂ ✓, 10 cm³ of steam ✗

As printed in the paper