Consider the reaction:
2NH3 (g) ⇌ N2 (g) + 3H2 (g)
Select the equilibrium constant expression.
(A) Kc = [NH3]2/[N2][H2]3
(B) Kc = [N2]2/[H2][NH3]
(C) Kc = [N2][H2]3/[NH3]2
What is the numerical value of Kc for the reaction if the concentrations at equilibrium are 0.19 M NH3, 5.0 M N2, and 0.60 M H2?
Express your answer using two significant figures.