The relative humidity of air is equal to the ratio of the, Ask an Expert

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The relative humidity of air is equal to the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature. If the relative humidity of the air is 57% and its temperature is 23°C, how many molecules of water are present in a room measuring 17 m*5.5 m*4.5 m? (The vapor pressure of water at 23°C is 21.07 torr.)

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