Horvath Practice Problems 101

Horvath Practice - on for the process to occur The T 4 S has units of energy and can be interpreted as the energy that is needed to produce the

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Hence, T 4 S 4 H. I fwerearrangeth isequat ionweget 4 H T 4 S 0 Thelefthandsideofthisequationprovidesaverynicemeasure of spontaneity of a reaction. We thus, de f ne what is called Gibbs free energy as the left hand side 4 G = 4 H T 4 S. If 4 G is negative the process will proceed, but if 4 G is positive the process will reverse. Finally, if 4 G is zero the process is at equilibrium. Gibbs Free Energy Notice how 4 G captures natures great compromise between enthalpy and entropy. The de f nition of 4 G also allows for another interpretation of G ibbsfreeenergy
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Unformatted text preview: on for the process to occur The T 4 S has units of energy and can be interpreted as the energy that is needed to produce the change in randomness associated 4 S. This energy is tied up and must be contained in the system. So if we consider 4 H as the total energy available and T 4 S as the tied up in randomizing the system, then 4 H − T 4 S is energy free to do work. Hence the term free energy Succinctly we say the Gibbs free energy is the energy available to do work. 100 GIBBS FREE ENERGY...
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This document was uploaded on 11/01/2011 for the course CHM 2046 at University of Florida.

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