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Both the forward and reverse reactions in the following equilibrium are believed to be elementary steps:...

Both the forward and reverse reactions in the following equilibrium are believed to be elementary steps:

CO (g) + Cl2 (g) <----> COCl (g) + Cl (g)

At 25C, the rate constants for the forward and reverse reactions are 2.1x10-29 M-1s-1 and 8.8x109 M-1s-1, respectively.

a) What is the value for the equilibrium constant at 25C?

b) Are the reactants or products favored at equilibrium?

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Answer #1

(a) Given : rate constant for forward reaction, kf = 2.1 x 10-29 M-1s-1

rate constant for reverse reaction, kr = 8.8 x 109 M-1s-1

Equilibrium constant, K = (rate constant for forward reaction) / (rate constant for reverse reaction)

K = kf / kr

K = (2.1 x 10-29 M-1s-1) / (8.8 x 109 M-1s-1)

K = 2.4 x 10-39

(b) Since value of equilibrium constant is less that 1, therefore reverse reaction is dominating than the forward reaction and reactants are favored at equilibrium.

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