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15 April, 03:11

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 255 torrtorr. Pure pentane and hexane have vapor pressures of 425 torrtorr and 151 torrtorr, respectively, at room temperature. What is the mole fraction of hexane?

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  1. 15 April, 03:28
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    The mole fraction of hexane is 0.6204

    Explanation:

    Obs: X hex = 1 - X pen

    Ptot = P pen + P hex

    Ptot = X pen P pen + X hex P hex - --> applying X hex = 1 - X pen

    X pen = (Ptot - P hex) / (P pen - P hex)

    X pen = (255 - 151) / (425 - 151) = 0.3795

    X hex = 1 - X pen

    X hex = 1 - 0.3795 = 0.6204
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