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.
⟹ ptotal=pH20+pgas\implies p_{total}=p_{H_20}+p_{gas}⟹ptotal=pH20+pgas
Given pgas=25.81mmHgp_{gas}=25.81mm Hgpgas=25.81mmHg ;ptotal=719torr=719mmHgp_{total}=719torr=719mmHgptotal=719torr=719mmHg
⟹ pgas=719−25.81=693.19mmHg\implies p_{gas}=719-25.81=693.19mmHg⟹pgas=719−25.81=693.19mmHg
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