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We hear reports from weather forecasters of “relative humidity,” the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature. (The vapor pressure of water at 32.2 °C is 36 mm Hg.)
(a) On a sticky, humid day, the relative humidity may reach 90% with a temperature of 90. °F (32.2 °C). What is the partial pressure of water under these conditions? How many moles per liter are present in the air? How many water molecules per cm3 are present in such air?
(b) On a day in a desert, the relative humidity may be 5.% with the same temperature of 90. °F. How many water molecules per cm3 are present in such air?
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