Practice question
Question
A solution of a non-volatile solute in water has a vapor pressure of 22.8 mm Hg at a temperature where pure water’s vapor pressure is 24 mm Hg. What is the relative lowering of vapor pressure?
Explanation
Relative lowering = (p⁰ - p/p⁰) . (24 - 22.8/24) = (1.2/24) = 0.05 .
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