$50\mathrm{g}$ of $\mathrm{CaCO}{}_3$ is heated: $\mathrm{CaCO}{}_3\to \mathrm{CaO}+\mathrm{CO}{}_2$. If $21\mathrm{g}$ of $\mathrm{CaO}$ is actually obtained, the percentage yield is (Ca = 40, C = 12, O = 16)

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