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03-02-2024
Chemistry

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Chalkboard chalk is made from calcium carbonate and calcium sulfate, with minor impurities such as SiO2. Only the CaCO3 reacts with dilute HCl(aq). What is the mass percent CaCO3 in a piece of chalk if a 3.28 g sample yields 0.981 g CO2(g). Answer 68.0%

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