Practice question
Question
The vapor pressure of pure benzene is 100 mm Hg at a certain temperature. If a solution with a non-volatile solute has a vapor pressure of 95 mm Hg, what is the mole fraction of benzene in the solution?
Explanation
Raoult’s law: p = p⁰ · xbenzene . 95 = 100 · xbenzene . xbenzene = (95/100) = 0.95 .
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