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The calcium content of calcium carbonate is expressed as a percentage.

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answer is B.

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Detailed Solution

Substitute calcium's atomic mass and calcium carbonate's molecular mass in the formula to calculate the mass per cent of calcium.

As a result, the calcium content of calcium carbonate is 40 per cent.

The molecular mass of ${CaCO}_{3}$ is 100 g/mol

The atomic mass of Ca= 40 g/mol

Mass percentage of Ca= $\frac{40}{100} \times 100 = 40 %$

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