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

Relative masses of atoms and molecules — practice question

What are the mass percentages of nitrogen in ammonium nitrate, NH$_4$NO$_3$, and in calcium nitrate, Ca(NO$_3$)$_2$?

  • A18% in NH$_4$NO$_3$; 14% in Ca(NO$_3$)$_2$
  • B18% in NH$_4$NO$_3$; 17% in Ca(NO$_3$)$_2$
  • C35% in NH$_4$NO$_3$; 9% in Ca(NO$_3$)$_2$
  • D35% in NH$_4$NO$_3$; 17% in Ca(NO$_3$)$_2$

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