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Empirical Formula

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Question

what is the percentage composition of calcium in calcium carbonate

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Solution

Dear student,

The atomic mass of calcium, carbon and oxygen is 40, 12 and 16, respectively.
Therefore, The molar mass of CaCO3 is,
40 + 12 + 3 x 16 = 40 + 12 + 48 = 100
Therefore, percent composition of Ca in CaCO3 is,
40/100 x 100 = 40%.

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