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Homework Help: Thermodynamic potentials

  1. Dec 7, 2004 #1
    Let’s say we have a 1 mol system in a state A (Pa,Va,Ta are given) and we take it to a state B(Pb,Vb are given) . We want to know what’s the maximum work we can give to a reversible work source. Considering the process is carried out attached to a 150 K heat source, the only data available is this:

    1. equation of adiabatic reversible curve
    2. Cp (heat capacity at a given constant pressure (Pa )
    3. Alpha (expansion coefficient at a given constant pressure (Pa )

    I’ve translated the problem into this: find A Helmholtz free energy change between points A and B. However I don’t know how to get dF=-SdT-PdV from the experimental coefficients mentioned above.

    I’d appreciate your help very much.
    Last edited: Dec 8, 2004
  2. jcsd
  3. Dec 8, 2004 #2
    Just a hint is enough. I don't have any sample problems nor thermo books so I don't know where to start from
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