03 Lecture 5 January 13 - 1/1 CHEM350: Lecture 5, Jan 13...

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1/1 CHEM350: Lecture 5, Jan 13 2010 Gibbs free energy for nonideal gases (section 7.5 in textbook) (continued) Notice that G o ( T ) in the previous expression is the ideal gas pressure at 1 bar. This means that the standard state of the nonideal gas is 1 bar once it has been adjusted to ideal behaviour, i.e f o = P o . This choice of standard state: Allows all gases to be brought to a single common state (hypothetical ideal gas at P = P o ). Allows us to develop a means of calculating f(T,P) at any temperature and pressure as follows. Let us consider the process illustrated above. We want an expression for the Gibbs free energy change, denoted by Δ G 1 in the figure, that occurs when we pass from the nonideal gas at temperature T and pressure P to the (hypothetical) ideal gas temperature T and pressure P . If we examine the direct step, we have Δ G 1 = G ideal ( T , P ) G ( T , P ) or Δ G 1 = RT ln P P o ln f f o = RT
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This note was uploaded on 04/11/2010 for the course CHEM 1101 taught by Professor Leroy during the Spring '10 term at University of Toronto- Toronto.

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03 Lecture 5 January 13 - 1/1 CHEM350: Lecture 5, Jan 13...

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