An equilibrium mixture at a certain temperature contains 1.15 M N2, 1.35 M H2, and 0.415 M NH3 at 500 oC. What is the equilibrium constant Kc for the following reaction?               NH3(g)  +  3H2(g)  ⇌  2NH3(g)          (A)  Kc = 0.00902          (B)  Kc = 0.0109          (C)  Kc = 0.0609          (D)  Kc = 0.178

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