O-LevelChemistryStoichiometry5070/12 · May/June 2020 · Q151 Mark
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?
A5 cm³ of CO2: ✓, 10 cm³ of O2: ✓, 80 cm³ of N2: ✓, 10 cm³ of steam: ✓
B5 cm³ of CO2: ✓, 10 cm³ of O2: X, 80 cm³ of N2: ✓, 10 cm³ of steam: X
C5 cm³ of CO2: ✓, 10 cm³ of O2: ✓, 80 cm³ of N2: X, 10 cm³ of steam: ✓
D5 cm³ of CO2: X, 10 cm³ of O2: X, 80 cm³ of N2: ✓, 10 cm³ of steam: X
✓ Correct answer
B: 5 cm³ of CO2: ✓, 10 cm³ of O2: X, 80 cm³ of N2: ✓, 10 cm³ of steam: X
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