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MIT OpenCourseWare http://ocw.mit.edu 5.111 Principles of Chemical Science Fall 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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reactants 19.1 5.111 Lecture Summary #19 CHEMICAL EQUILIBRIUM (Chapter 9 Section 9.0-9.9) Topics Nature of Chemical Equilibrium Meaning of K Relationship between Equilibrium Expressions External Effects on K Chemical reactions reach a state of dynamic equilibrium in which the rates of forward and reverse reactions are equal and there is no net change in composition. Consider: N 2 (g) + 3H 2 (g) 2NH 3 (g) G° = -32.90 kJ/mol conc time When the reaction mixture has not produced enough products to have reached equilibrium, the spontaneous direction of change is toward more products ( G forward reaction ___ 0). When excess products are present (ex. pure ammonia), the reverse reaction is spontaneous ( G forward reaction ______ 0). Progress of reaction Free energy, G Pure Pure products G < 0 G = 0 G > 0
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19.2 The reaction free energy ( G) changes as the proportion of reactants and products change. To find out how G changes with composition of reactants and products, we need to know how the molar free energy of each substance varies with its partial pressure (if gas), or with its
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This note was uploaded on 11/27/2011 for the course CHEMICAL E 20.410j taught by Professor Rogerd.kamm during the Spring '03 term at MIT.

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lecnotes19 - MIT OpenCourseWare http:/ocw.mit.edu 5.111...

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