When calcium carbonate is heated, calcium oxide and carbon dioxide gas are produced. The reaction equation is given as: $\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$. A mass of $225\,\text{kg}$ of calcium carbonate is heated until the mass stops changing. The mass of calcium oxide obtained is $85\,\text{kg}$. What is the percentage yield?
- A37.8%
- B47.2%
- C67.5%
- D85.0%