O-LevelChemistryStoichiometry5070/11 · May/June 2012 · Q111 Mark

The equation for the burning of hydrogen in oxygen is shown. 2H2(g) + O2(g) → 2H2O(g) What does this equation indicate?

A2 atoms of hydrogen combine with 2 atoms of oxygen.

B2 g of hydrogen combine with 1 g of oxygen.

C2 moles of steam can be obtained from 0.5 mole of oxygen.

D2 moles of steam can be obtained from 1 mole of oxygen.

✓ Correct answer

D: 2 moles of steam can be obtained from 1 mole of oxygen.

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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 11.

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