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A sample of XeO4 was fully decomposed into its elements, and the resulting gas was collected...

A sample of XeO4 was fully decomposed into its elements, and the resulting gas was collected over water at 29°C. If the total pressure of the collected gas was 750 torr, and the vapor pressure of water at 29°C is 30.0 torr, what was the partial pressure of O2 gas in the flask?

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