Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

The equation for the reaction of magnesium with dilute hydrochloric acid is shown here: $\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2$. What mass of magnesium chloride is produced when $48.0\,\text{g}$ of magnesium reacts completely with excess dilute hydrochloric acid?

  • A$23.8\,\text{g}$
  • B$47.5\,\text{g}$
  • C$95.0\,\text{g}$
  • D$190\,\text{g}$

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