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Chemistry 9 Online
OpenStudy (anonymous):

35mL of hydrogen gas is collected over water at 24 degrees C. The total pressure of the sample is 755 millimeters of mercury. At 24 degrees C, the vapor pressure of water is 22 millimeters of mercury. a) what is the partial pressure of the hydrogen gas? b) what is the volume of the hydrogen gas at STP?

OpenStudy (jfraser):

the gas is collected over water, so there are tiny amounts of water vapor mixed in with the hydrogen gas. The vapor pressure of the whole thing is 755mmHg. The vapor pressure of the tiny amount of water vapor is 22mmHg. The rest of the pressure must come from the hydrogen gas

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