Chemistry 5070 · O Level · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

These compounds can be used as nitrogenous fertilisers. Which compound has the smallest percentage by mass of nitrogen?

  • A$(\text{NH}_2)_2\text{CO} \; [M_r = 60]$
  • B$(\text{NH}_4)_2\text{SO}_4 \; [M_r = 132]$
  • C$(\text{NH}_4)_3\text{PO}_4 \; [M_r = 149]$
  • D$\text{NH}_4\text{NO}_3 \; [M_r = 80]$

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