Question: When solid KClO 3 is heated strongly, it decomposes to form solid potassium chloride, KCl, and O 2 gas. A 0.415 g sample of impure

When solid KClO3 is heated strongly, it decomposes to form solid potassium chloride, KCl, and O2 gas. A 0.415 g sample of impure KClO3 is heated strongly and the O2 gas produced by the decomposition is collected over water. When the wet O2 gas is cooled back to 26 °C, the total volume is 229 mL and the total pressure is 323 Torr. What is the mass percentage of KClO3 in the original sample? Assume that none of the impurities produce oxygen on heating. The vapor pressure of water is 25.22 Torr at 26 °C.

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To find the mass percentage of KClO3 in the original sample we can use the ideal gas law and the information provided The key is to determine the moles of O2 gas produced and then use stoichiometry to ... View full answer

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