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

Relative masses of atoms and molecules — practice question

Sodium phosphate, $\text{Na}_3\text{PO}_4$, and ammonium nitrate, $\text{NH}_4\text{NO}_3$, are both employed as fertilisers. Which row gives the correct percentage by mass of the element in each compound that helps plant growth?

  • A19; 18
  • B19; 35
  • C42; 18
  • D42; 35

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