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O-LevelChemistryStoichiometry5070/11 · May/June 2023 · Q71 Mark

Three compounds are listed. • calcium carbonate • potassium sulfate • zinc nitrate Which row shows the element present in the greatest percentage by mass in each compound? [Ar: Ca, 40; C, 12; O, 16; K, 39; S, 32; Zn, 65; N, 14]

Aelement present in the greatest percentage by mass in calcium carbonate: calcium, element present in the greatest percentage by mass in potassium sulfate: oxygen, element present in the greatest percentage by mass in zinc nitrate: oxygen
Belement present in the greatest percentage by mass in calcium carbonate: calcium, element present in the greatest percentage by mass in potassium sulfate: oxygen, element present in the greatest percentage by mass in zinc nitrate: zinc
Celement present in the greatest percentage by mass in calcium carbonate: oxygen, element present in the greatest percentage by mass in potassium sulfate: potassium, element present in the greatest percentage by mass in zinc nitrate: zinc
Delement present in the greatest percentage by mass in calcium carbonate: oxygen, element present in the greatest percentage by mass in potassium sulfate: potassium, element present in the greatest percentage by mass in zinc nitrate: oxygen

✓ Correct answer

D: element present in the greatest percentage by mass in calcium carbonate: oxygen, element present in the greatest percentage by mass in potassium sulfate: potassium, element present in the greatest percentage by mass in zinc nitrate: oxygen

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About this question

Topic
Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, May/June 2023 Paper 1 Variant 1, question 7.

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