Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

When magnesium reacts with oxygen, magnesium oxide is produced. The reaction is represented by the equation below. $2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}$ What mass of magnesium oxide will be produced when $48\,\text{g}$ of magnesium is burned?

  • A$20\,\text{g}$
  • B$40\,\text{g}$
  • C$80\,\text{g}$
  • D$160\,\text{g}$

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