O-LevelChemistryStoichiometry5070/11 · May/June 2018 · Q121 Mark

The relative formula masses of four compounds are given. A student has a 1.0 g sample of each compound. Which sample contains the highest number of moles of oxygen atoms? compound relative formula mass A Al₂O₃ 102 B CuO 80 C H₂SO₄ 98 D HNO₃ 63

AAl₂O₃

BCuO

CH₂SO₄

DHNO₃

✓ Correct answer

D: HNO₃

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2018 Paper 1 Variant 1, question 12.

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