Posted by Cassie on Tuesday, March 15, 2011 at 1:00am.
Total pressure is 755.2 as measured by the barometer. The total is composed of two partial pressures; i.e., that of the H2 gas + the water vapor at 22 C.
Ptotal = PH2 + PH2O. You can look up the vapor pressure of water in tables at various temperatures to find PH2O, then subtract from 755.2 to find the PH2 as a DRY gas (as opposed to the wet gas in the original problem.
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