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What is the expression for the equilibrium constant (K_c...

What is the expression for the equilibrium constant (K_c) for the following reaction? N_2(g) + O_2(g) ⇌ 2NO_(g)

A.

$\frac{[NO^2]}{[N^2] + [O^2]}$

B.

$\frac{[2NO]^2}{[N_2][O_2]}$

C.

$\frac{[N_2] + [O_2]}{2[NO]^2}$

D.

$\frac{[NO]^2}{[N_2][O^2]}$

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Correct answer is D

No explanation has been provided for this answer.

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