A 5.000g sample of a dry mixture of potassium hydroxide, potassium carboate and potassium chloride is reacted with 0.100 L of 2.00-molar HCl solution. A 249.0 mL sample of dry carbon dioxide gas, measured at 22.0 degree Celsius and 740.0 torr, is obtained from this reaction. What was the percentage of potassium carbonate in the mixture?

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  1. Use PV = nRT to solve for n = mols CO2.
    mols CO2 = mols K2CO3
    Then grams K2CO3 = mols K2CO3 x molar mass K2CO3.
    %K2CO3 = (grams K2CO3/mass sample)*100 = ?

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