5_60_lecture21

5_60_lecture21 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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MIT OpenCourseWare http://ocw.mit.edu 5.60 Thermodynamics & Kinetics Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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5.60 Spring 2008 Lecture #21 page 1 Two-Component Phase Equilibria II Ideal and Non-Ideal Solutions How do we use liquid-gas binary mixture phase diagrams? We use them to find the compositions of the gas and liquid phases at coexistence. Consider again our typical system: A(g), y A (T,p) Here A is more volatile than B B(g), y B =1-y A (for constant T, p A * > p B * ). A( ), x A Suppose start at point “1” in the B( ), x B =1-x A pure liquid phase. As we decrease the pressure, we eventually reach “2” on the p Liquid coexistence line. p A * phase 1 2 * The system now consists of a 2’ p B gas liquid phase and a very small phase amount of gas phase. The composition of the liquid 0 y B (2) x B (2) phase at this point is x B (2). x B ,y B To find out the composition of the gas phase, we have to switch to the coexistence line that is described by y B , keeping p the same.
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This note was uploaded on 11/27/2011 for the course CHEM 5.43 taught by Professor Timothyf.jamison during the Spring '07 term at MIT.

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5_60_lecture21 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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