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15 June, 23:38

The vapor pressure of a solution containing 53.6 g glycerin (c3h8o3) in 133.7 g ethanol (c2h5oh) is 113 torr at 40°c. calculate the vapor pressure of pure ethanol at 40°c assuming that glycerin is a nonvolatile, nonelectrolyte solute in ethanol.

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  1. 15 June, 23:58
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    Moles glycerin = 53.6 g / 92 g/mol = 0.582

    Moles ehanol = 133.7 g / 46 g/mol = 2.91

    total moles = 3.492

    Moles fraction ethanol = 2.91 / 3.492 = 0.833

    p = p° X

    113 = p° 0.833

    p° = 135.6 torr
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