We first write the equilibrium expression for the reaction. Second, we substitute the concentration values into the

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We first write the equilibrium expression for the reaction. 

Keg [NO2]2 [NO]2 [02]


Second, we substitute the concentration values into the expression. 

Keq : [2.2  106]2 [1.5  10-11] [8.9  103] 2.4  1012


The large Keq for this reaction indicates that the equilibrium overwhelmingly favors the formation of the product, NO2. However, Keq does not indicate the rate of reaction. In the atmosphere, the conversion of NO to NO2 takes place slowly.

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