Heating solid potassium chlorate with manganese dioxide catalyst produces solid potassium chloride and oxygen gas. If 455

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Heating solid potassium chlorate with manganese dioxide catalyst produces solid potassium chloride and oxygen gas. If 455 mL of wet oxygen are collected over water at 23 °C and 766 mm Hg, what mass of potassium chlorate was decomposed? The vapor pressure of water at 23 °C and 21 mm Hg.

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