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The temperature of water is implicitly covered by actual and saturated vapour content, or equivalent vapour pressures. There is deterministic relation between relative humidity, air temperature and temperature of water, supposed to be in dynamic equilibrium. In such a state, the cooling effect of water evaporation is balanced by the thermal transfer from ...


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The key to understanding this type of question is that the equilibrium (saturation) vapor pressure of a pure liquid is to a first approximation (that is, assuming ideal behavior) independent of the presence of other gases, such as (in this case) oxygen. Therefore, you can think of $\pu{355 Torr}$ as being always the pressure of the vapor when in equilibrium ...


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