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VLE help

  1. Sep 12, 2008 #1
    For an equimolar solution of n-pentane and n-hexane, compute:
    a) dew-point pressure at 120 F
    b) bubble-point temperature at 1 atm
    c) the vapor fraction at 120 F and 0.9 atm, and the mole fractions of the vapor and liquid phases

    My attempt at a solution:
    I calculated the saturation pressures of both pentane and hexane, 1.52 and 0.51, respectively. Now i don't know what to use for xi and yi. I think i need to compute the K value, but still, i am stuck. Can anyone help? thanks!
  2. jcsd
  3. Oct 21, 2008 #2
    I think that the law of Raoult is the one you want to use.... but I am not certain that you have enough data for question c). I'd expect a volume and a total amount of solution given there.
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