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March 30, 2017

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A mixture of ethyl iodide (b.p. 72.3) and water boils at 63.7 C. What weight of ethyl iodide would be carried over by 1 gm of steam during steam distillation

  • organic chem - ,

    Do you have the vapor pressure at the appropriate temperature in your problem.

  • organic chem - ,

    You need only to know the vapor pressure of water at that b.p. which is ~ 179 mm hg, so the (vapor pressure of C2H5I = 760 - 179 )and since you know (M.W. of H2O = 18 g/mol, & M.W. C2H5I = 156 g/mol), you just apply the equation:
    grams H2O M.W. H2O × P H2O
    ---------------------- = --------------------------------------- = 28.13 grams C2H5I
    grams C2H5I M.W. C2H5I × P C2H5I

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