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

Relative masses of atoms and molecules — practice question

Which compound has a nitrogen mass percentage of $45.2\%$? $[A_r: \text{C}, 12; \text{H}, 1; \text{N}, 14]$

  • Aethane-1,2-diamine, $\text{NH}_2\text{C}_2\text{H}_4\text{NH}_2$
  • Bhydroxylamine, $\text{NH}_2\text{OH}$
  • Cmethanamide, $\text{HCONH}_2$
  • Dmethylamine, $\text{CH}_3\text{NH}_2$

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