final_exam_rev

# final_exam_rev - 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 Final Exam Review 1. Phase Equilibria- 2 components a. Drawing P-x,y and T-x,y diagrams 2. Ideal and Non Ideal Solutions a. Raoult’s Law, Henry’s Law, Dalton’s Law i. Dalton’s Law: p A = y A p ii. Raoult’s Law: p A = x A p A * and p B = x B p B * = (1-x A )p B * iii. Henry’s Law: p B = x B K B b. Chemical potential and Ideal Solutions c. Entropy of Mixing, Free Energy of mixing i. Δ G mix = nRT(x A lnx A + x B lnx B Purely entropic, as in gas mixture. ii. Δ H mix = Δ G mix + T Δ S mix = 0 No enthalpy change, Δ G is due to entropy of mixing iii. mix mix T G V p ⎛⎞ ∂Δ Δ= = ⎜⎟ ⎝⎠ 0 No volume change, just like ideal gas d. Non ideal solutions i. Positive Deviations: Δ u > 0 (most common) Mixing is energetically not favorable in liquid phase
ii. Vapor pressure is higher than expected by Raoult’s Law iii. Can make same argument for negative deviation.

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final_exam_rev - MIT OpenCourseWare http/ocw.mit.edu 5.60...

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