Practice question
Question
The vapor pressure of pure water is 25 mm Hg at a certain temperature. What is the vapor pressure of a solution containing 0.1 mole of a non-volatile solute in 0.9 mole of water?
Explanation
Mole fraction of water = (0.9/0.9 + 0.1) = 0.9 . Vapor pressure = 25 × 0.9 = 22.5 mm Hg .
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