O-LevelChemistryStoichiometry5070/12 · Oct/Nov 2018 · Q221 Mark

Which fertiliser contains the highest percentage of nitrogen by mass?

Aammonium nitrate, NH4NO3; formula mass is 80

Bammonium phosphate, (NH4)3PO4; formula mass is 149

Cammonium sulfate, (NH4)2SO4; formula mass is 132

Dpotassium nitrate, KNO3; formula mass is 101

✓ Correct answer

A: ammonium nitrate, NH4NO3; formula mass is 80

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Topic: Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2018 Paper 1 Variant 2, question 22.

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