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Homework Help: Phase Equilibria, Condense Phases

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data

    I'm given vapor pressures of an assumed ideal gas:
    (Clausius Clapeyron.. ln(p) = -A/T-BlnT+C)
    I am given A, B, C for liquid and solid.
    And given T,melt.

    I am to find what the first condense phase is, and at what temperature, given isothermal compression from T>Tmelt and P < Patm

    2. Relevant equations

    Clausius Clapeyron.. ln(p) = -A/T-BlnT+C
    dG(gas)/dP = Vg = RT/P

    3. The attempt at a solution

    At first glance, I assumed I would just have to find the P values in the Clausius Clapeyron for the temperature given...assuming that when the pressure on the system = pressure from the liquid or solid phase, (as given in the above eq), the condense phase would be the lowest pressure...
    Am I assuming this to be too easy?
    I have no examples, and no notes on isothermal compression's effect on vapor pressures...
  2. jcsd
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