Practice question
Question
A solution of a non-volatile solute reduces the vapor pressure of a solvent from 30 mm Hg to 27 mm Hg. What is the mole fraction of the solvent?
Explanation
(p⁰ - p/p⁰) = xsolute . (30 - 27/30) = 0.1 . Mole fraction of solvent = 1 - 0.1 = 0.9 .
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