A pure rock sample believed to be pure calcium carbonate

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A pure rock sample believed to be pure calcium carbonate is subjected to chemical analysis and found to contain 51.3% Calcium, 7.7% Carbon and 41.0% Oxygen by mass. Why can't this rock sample be pure Calcium Carbonate.

Reference no: EM13643373

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A pure rock sample believed to be pure calcium carbonate : a pure rock sample believed to be pure calcium carbonate is subjected to chemical analysis and found to contain 51.3

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