O-LevelChemistryStoichiometry5070/11 · May/June 2012 · Q371 Mark

A 10 cm³ sample of a gaseous hydrocarbon is completely burnt in oxygen. The total volume of the products is 70 cm³. All gas volumes are measured at room temperature and pressure. Which equation represents the combustion of the hydrocarbon?

ACH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

BC2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(g)

CC3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

D2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g)

✓ Correct answer

C: C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2012 Paper 1 Variant 1, question 37.

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