Practice question
Question
A non-volatile solute lowers the vapor pressure of water from 20 mm Hg to 19.8 mm Hg. What is the mole fraction of the solute?
Explanation
Relative lowering = (p⁰ - p/p⁰) = xsolute . (20 - 19.8/20) = (0.2/20) = 0.01 .
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