Identify the proper form of the equilibrium-constant expression for the equation
N2(g) + O2(g) ⇌ 2NO(g)
a. K = [NO] / [N2][O2]
b. K = [NO]2 / [N2][O2]
c. K = [N2][O2] / [NO]2
d. K = 2[NO] / [N2][O2]
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