chemistry

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what is the partial pressure of 02 collected over water at 25 degree C and 630 torr (vapor pressure of H20 at 25 degree C is 23.8 torr)

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    Dalton's Law tell us that the total pressure is the sum of the partial pressures of the gases.
    Ptotal = PO2 + PH2O
    630 torr = PO2 + 23.0
    Solve for PO2.

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