You are given 1

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You are given 1.382 g of a mixture of KClO3 and KCl. When heated, the KClO3 decomposes to KCl

and O2,

2 KClO3 (s) → 2 KCl (s) + 3 O2 (g),

and 279 mL of O2 is collected over water at 22 °C. The total pressure of the gases in the collection flask is 742 torr. What is the weight percentage of KClO3 in the sample?

The formula weight of KClO3 is 122.55 g/mol. The vapor pressure of water at 22 °C is 19.8 torr.