5_60_lecture20

5_60_lecture20 - 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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Lecture #20 page 1 Two-Component Phase Equilibria Goal: Understand & predict effects of mixing of substances on vapor pressure, boiling point, freezing point, etc. Binary liquid-gas mixtures (non-reacting): Total # of variables: 4 ( T , p , x A , y A ) Constraints due to coexistence: 2 µ A ( A ) = µ A (g) µ B ( A ) = µ B (g) # independent variables F = 4 – 2 = 2 Only 2! e.g. knowing (T,p) uniquely determines the compositions in the liquid & gas phases Generalization: Gibbs phase rule gives # independent variables needed to describe a multi-component system where different phases coexist in equilibrium F = C P + 2 F
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5_60_lecture20 - MIT OpenCourseWare http:/ocw.mit.edu 5.60...

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