Given the following mole fractions and vapor pressures for ...

[saraeharris]

Given the following mole fractions and vapor pressures for miscible liquids E and F, calculate
  the composition (in mole percent) of the vapor from a distilling ideal binary solution at 150
  and 760 mm Hg. (The vapor pressures PE and PF are the values at 150C.)
  XE = 0.40 XF = 0.60
  PE = 1710 mm Hg PF = 127 mm Hg

Question 2

A mixture of ideal miscible liquids C and D is distilled at 760 mm Hg pressure. At the start of
  the distillation, the mole percent of C in the mixture is 90.0, while that of D is 10.0. The vapor is
  condensed and found to contain 15.0 mole percent of C and 85.0 mole percent of D. Calculate
  the following.
  (a) The partial vapor pressures (P) of C and D in this mixture
  (b) The vapor pressures (P) of pure C and D

[kiamars2010]

Answer to Question 1

X'E = (0.40 x 1710)/760 = 0.90, or 90 mol
X'F = 10 mol  

Answer to Question 2

(a) PC = 760 X'C = 760 (0.150) = 114 mm Hg
PD = 646 mm Hg
(b) P C = PC/XC = 114/0.900 = 127 mm Hg
P D = 6460 mm Hg

[saraeharris]

TY

[kiamars2010]

You're welcome