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3.0182 g of a sample of potassium carbonate and barium carbonate was treated with dilute sulfuric acid. The hydrogen gas was collected over water and measured a volume of 440 mL at a temperature of 25 °C. The atmospheric pressure was 757 mm of Hg and the pressure of water vapor at 25 °C is 22.4 mm of Hg. After the reaction, 2.427 g of barium sulfate was isolated. Calculate the % composition of the mixture.