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The Vapor pressures of pure propyl alcohol and isopropyl alcohol are 21.0 mmHg and 45.2 mmHg, respectively, at 25 (degrees)C. Calculate the partial pressure of isopropyl alcohol above a solution in which the mole fraction of propyl alchol is 0.250.

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  1. Psoln = Xip*Poip

    Xpropyl = 0.250; therefore, Xipropyl = 0.750
    Plug into the above.
    Check my thinking.

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