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A sample of potassium chlorate us heated and decomposes to produce 229mL O2 gas, which was collected over water at 20 Celsius at a total pressure of 754 Torr. What is the partial pressure of O2 gas, if the partial pressure of water at 20 Celsius is 17 Torr

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Smoke and mirrors.
pO2 + pH2O = Ptotal = 754 torr

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