Lecture19A - Lecture 19 1 Standard States, Non-ideality and...

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Unformatted text preview: Lecture 19 1 Standard States, Non-ideality and Gibbs-Helmholtz (22.6-8) In the last two lectures we began to develop tools for evaluating thermodynamic properties of non-ideal gases. Note that S 's are reported for ideal gas behavior (using stat. mech methods). This is easy to do. First take real gas at 1 bar to a low pressure, where ideal behavior will exist. ( 29 1 1 ' at constant T id P id bar P V S S bar dP T - = - id Next, take the ideal gas from low P back to 1 bar. ( 29 1 ' 1 ' id bar id P dP S bar S R P- = - Lecture 19 2 Combining the two equations in a thermodynamic way: ( 29 ( 29 1 1 1 1 1 ' ' ' ' ' id id id bar P bar P bar P P P R V V R S bar S bar dP dP dP P T T P - = -- =- 2 From last lecture: V P dB V R T P dT = + ( 29 ( 29 { ( 29 1 2 2 depends on T only 1 1 ' 1 id bar V V id P dB dB S bar S bar dP P bar P dT dT - = =- Can make id P ( 29 ( 29 2 1 1 1 V dB S bar S bar bar dT = + ( 29 ( 29 2 0 so 1 1 , but difference is usually small....
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This note was uploaded on 04/08/2010 for the course CHEM 444 taught by Professor Jameslis during the Spring '08 term at University of Illinois at Urbana–Champaign.

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Lecture19A - Lecture 19 1 Standard States, Non-ideality and...

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