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Chemistry, 21.07.2020 20:01 zekrader18
Distillation is a method of purification based on successive separations and recondensations of vapor above a solution.
A. The vapor pressure of carbon tetrachloride, CCl4, is 0.354 atm and the vapor pressure of chloroform, CHCl3, is 0.526 atm at 316 K. A solution is prepared from equal masses of these two compounds at this temperature. The mole fraction of chloroform in the vapor above this solution is χCHCl3 = 0.657. If the vapor above the original solution is condensed and isolated into a separate flask, the vapor pressure of chloroform above this new solution is 0.346 atm.
Calculate the mole fraction of chloroform in the vapor above a solution obtained by three successive separations and condensations of the vapors above the original solution of carbon tetrachloride and chloroform.
χCHCl3=
B. Show how this result explains the use of distillation as a separation method.
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