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Homework Help: Constraints on the Gibbs Equation, Tds = dh - vdP

  1. Sep 26, 2012 #1
    1. The problem statement, all variables and given/known data
    What constraints are imposed on the use of the Gibbs equation Tds = dh - vdP

    2. Relevant equations

    Tds = dh - vdP

    3. The attempt at a solution

    I seem to be stuck on this question. So far I have come up with the following constraints, but I'm not even sure if they are correct:

    1. The equation holds for only closed systems at constant pressure
    2. The equations holds only for systems in which the free energy depends only on P and T.
    3. The equation doesn't apply on mixtures or supercooled liquids.
  2. jcsd
  3. Sep 28, 2012 #2

    rude man

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    Homework Helper
    Gold Member

    #1 can't be right - there is dp in the formula ...
    #2 ???
    #3 ???

    So: 1st hint: how does the term Tds enter your equation?
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