On a given day, the weatherman reports that the atmospheric pressure is 50F, and the relative humidity is 45%. If the (pure) vapor pressure of water at 50F is 9.2 torr, then the partial pressure of water in the atmosphere is?
data given by the problem statement:
the atmosphric pressure =50F
the relative humidity = 45%
the pure vapoure pressure of water = 9.2torr
the partial pressure of water in the atmosphere=?
the answer is "the vapoure pressure of water in the atmosphere is equal to partial pressure"
because according to Dalton's law and Roult's law as follows respectively
hence partial pressure of water in atmosphere does not influenced by change in the humidity.
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