15 Equilibrium Constants

# 15 Equilibrium Constants - Which one of the following...

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1 1 Which one of the following statements about a reaction is not correct? If all are correct, respond (E). Remember: G = G o + RT ln(Q). A) If G > 0, then products will be converted to reactants until equilibrium is reached. B) At equilibrium, G = 0. C) The equilibrium constant, K, is determined by the standard free energy change, G o , for the reaction. D) The equilibrium constant, K, is determined by the rate constants for the elementary reactions in a reaction mechanism. E) All the above (A – D) are correct. 2 Ch. 14 QRT Homework 19, 21, 26, 41, 45, 47, 53

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2 Fig. 14-1, p.674 Illustration of the fact that the equilibrium concentrations are independent of the initial conditions for the same amount of each element. Equilibrium is independent of the direction of approach to equilibrium! 4 What else should you know about equilibrium constants? Catalysts lower the activation energy and increase the reaction rate. They do not affect the equilibrium constant. Because a catalyst increases the rate for both the forward and reverse reactions. ( ) / ( ) / ( ) / ( ) / ( ) / ( )/ ( / o o TS R o o TS P o o o o o o o o G G RT G G RT G G G G RT R P R P TS TS TS TS o o o o G G RT G G RT R P P R o PR G G RT f G G RT r G RT k Ae K k Ae K e e K e e K e  k = e -Ea/RT
3 5 One more thing - Pure liquids and solids do not appear in the equilibrium constant expression.

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## This note was uploaded on 06/29/2008 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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15 Equilibrium Constants - Which one of the following...

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