O-LevelChemistryStoichiometry5070/12 · May/June 2021 · Q121 Mark

10 cm³ of propane is burned in 70 cm³ of oxygen in a closed container. C3H8(g) + 502(g) → 3CO2(g) + 4H2O(l) What is the total volume of gas present after the reaction? (Assume all volumes of gases are measured at room temperature and pressure.)

A30 cm³

B50 cm³

C70 cm³

D90 cm³

✓ Correct answer

B: 50 cm³

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 12.

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