When calcium carbonate is heated, it breaks down to give calcium oxide and carbon dioxide gas. The reaction can be written as: $\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$ A sample of $225\,\text{kg}$ of calcium carbonate is heated until the mass stops changing. The mass of calcium oxide produced is $85\,\text{kg}$. Calculate the percentage yield.
- A37.8%
- B47.2%
- C67.5%
- D85.0%