The total pressure exerted by a wet gas is equal to the sum of the partial pressure of the gas itself + the vapor pressure of water at that temperature.
"\\implies p_{total}=p_{H_20}+p_{gas}"
Given "p_{gas}=25.81mm Hg" ;"p_{total}=719torr=719mmHg"
"\\implies p_{gas}=719-25.81=693.19mmHg"
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