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

Relative masses of atoms and molecules — practice question

By referring to the Periodic Table for the relative atomic masses, which one has the smallest mass?

  • A$0.1$ moles of silicon dioxide, $\text{SiO}_2$
  • B$0.5$ moles of oxygen, $\text{O}_2$
  • C$0.5$ moles of lithium, $\text{Li}$
  • D$1.0$ moles of ammonia, $\text{NH}_3$

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