Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

The equation for magnesium reacting with oxygen is shown. $2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}$ What mass of oxygen will react completely with $6\,\text{g}$ of magnesium?

  • A$2\,\text{g}$
  • B$4\,\text{g}$
  • C$8\,\text{g}$
  • D$16\,\text{g}$

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