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Unformatted text preview: BMB428 Dr. Song Tan Physical Chemistry with Biological Applications Fall 2007 Problem Set 9: The Maxwell Relations & The Third Law Due Sept 27, 2007 We have defined a useful quantity called entropy, and we have seen that a positive entropy correlates with a spontaneous change for an isolated system. Since entropy is so useful, we would like to derive mathematical expressions for such quantities as S P S T or S V , . The concept of a Maxwell relation combined with other mathematical techniques will allow us to find the necessary equations. The goal of all the derivations will be to express changes in entropy as a function of properties of a system which are easy to manipulate experimentally. 1. To calculate S P T , we will introduce a new property of a system called free energy. The Gibbs free energy of a system is G = H - TS. From this definition, we can derive that d G = -S d T + V d P....
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This note was uploaded on 07/23/2008 for the course BMB 428 taught by Professor Tan during the Fall '07 term at Pennsylvania State University, University Park.
- Fall '07