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13 May, 23:56

What is the mole fraction of a nonelectrolyte in a aqueous above which the vapor pressure of water is 745 mm hg at 100C

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  1. 14 May, 00:20
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    Rault's law: the vapor pressure of a non-volatile solution is equal to the vapor pressure of the solvent times the molar fraction of the solvent (at the same temperature).

    Pv water in the solution = X water * Pv of pure water

    745 mmHg = Xw * 760 mmHg

    Xw = 745/760 = 0.98

    Molar fraction of the solute = 1 - 0.98 = 0.02

    Answer: 0.02
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