Practice question
Question
The vapor pressure of pure toluene is 40 mm Hg at a certain temperature. If a solution with a non-volatile solute has a vapor pressure of 38 mm Hg, what is the mole fraction of the solute?
Explanation
(p⁰ - p/p⁰) = xsolute . (40 - 38/40) = (2/40) = 0.05 .
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