Thermodynamic potentials


by Feynmanfan
Tags: potentials, thermodynamic
Feynmanfan
Feynmanfan is offline
#1
Dec7-04, 04:50 PM
P: 129
Letís 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 whatís 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 )

Iíve translated the problem into this: find A Helmholtz free energy change between points A and B. However I donít know how to get dF=-SdT-PdV from the experimental coefficients mentioned above.

Iíd appreciate your help very much.
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Feynmanfan
Feynmanfan is offline
#2
Dec8-04, 05:22 AM
P: 129
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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