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Chemistry · May / June 2018 · Paper 12 · Question 24

5070The mole and the Avogadro constant

The compounds shown can be used as nitrogenous fertilisers. Which compound has the lowest percentage by mass of nitrogen?

  1. A(NH2)2CO [Mr: 60]
  2. B(NH4)2SO4 [Mr: 132]
  3. C(NH4)3PO4 [Mr: 149]
  4. DNH4NO3 [Mr: 80]

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Correct answer: B. (NH4)2SO4 [Mr: 132]

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