determine the equilibrium constant?

Question

Use the equilibrium constants for the following reactions
2NO(g) = N2(g) + O2(g) K1 = 2.4 x 1030

2NO(g) + O2(g) = 2NO2(g) K2 = 2.4 x 1012

to determine the equilibrium constant for the reaction below.


N2(g) + 2O2(g) = 2NO2(g)

K =?

Answer 1

K1 = [N2][O2]/[NO]^2
K2 = [NO2]^2/[NO]^2[O2]

For the third reaction, the K expression is [NO2]^2/[N2][O2], which you can get by dividing K2 by K1, so the value of K will be 2.4 x 10^12/2.4 x 10^30 or 1.0 x 10^-18.

Answer 2

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