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A white powder, consisting of a simple mixture of tartaric acid (C4H6O6) and citric acid (C6H8O7)...

A white powder, consisting of a simple mixture of tartaric acid (C4H6O6) and citric acid (C6H8O7) was analysed to determine the elemental composition. Combustion of a 462.3-mg sample produced 597.4 mg of CO2 and 170.6 mg of H2O. Use atomic masses: C 12.011; H 1.00794; O 15.9994.

Question: Calculate the % citric acid, by mass, in the sample.

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