GKFix MCQ Question

What is the equilibrium constant expression for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g)?

• A. Kc = [N2][H2]^3 / [NH3]^2
• B. Kc = [NH3]^2 / ([N2][H2]^3)
• C. Kc = [NH3] / ([N2][H2])
• D. Kc = [N2][H2] / [NH3]