Chemistry 0620 · IGCSE · The mole and the Avogadro constant

The mole and the Avogadro constant — practice question

On heating, copper(II) oxide, $\text{CuO}$, reacts with ammonia, $\text{NH}_3$. $3\text{CuO} + 2\text{NH}_3 \rightarrow 3\text{Cu} + \text{N}_2 + 3\text{H}_2\text{O}$ $8.5\,\text{g}$ of ammonia reacts with an excess of copper(II) oxide to produce $26.4\,\text{g}$ of copper. Calculate the percentage yield of copper in this reaction.

  • A$27.5\%$
  • B$32.2\%$
  • C$55.0\%$
  • D$82.5\%$

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