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    Stereochemistry and Fractional Distillation

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    Part I: Refer to attachment for stereochemistry.

    Part II:
    TEMP(C) mmHg TEMP(C) mmHg
    Benzene 30 120 Toluene 30 37
    40 180 40 60
    50 270 50 95
    60 390 60 140
    70 550 70 200
    80 760 80 290
    90 1010 90 405
    100 1340 100 560
    110 760

    1. What is the mole fraction of each component if 3.9g of benzene C6H6 is dissolved in 4.6g of toluene C7H8?
    2. Assuming that this mixture is ideal, (ie. follows Raoult's Law) what is the partial vapor pressure of benezene in this mixture at 50 (C)?
    3. Estimate to the nearest degree the temperature at which the vapor pressure of the solution equals 1 atm (bp of the solution).
    4. Calculate the composition of the vapor (mole fraction of each component) that is in equilibrium in the solution at the boiling point of this solution.
    5. Calculate the composition in weight percentage of the vapor that is in equilibrium with the solution.

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    Solution Preview

    See attached files for calculations. You might need to zoom in on the pictures, or print them out to view them correctly. I scanned them at high ...

    Solution Summary

    The attached files include calculations. In the excel file the columns are (A) temperature (deg C), (B) vapor pressure of benzene, (C) vapor pressure of toluene and (D) total vapor pressure of the mixture, equal to 1/2(Pben+Ptol). The graphs in the excel files show that we can make some very reasonable assumptions about linearity.