For N₂ + 3H₂ ⇌ 2NH₃ the equilibrium concentrations are [N₂] = 1, [H₂] = 2 and [NH₃] = 6 mol/L. What is Kc?

Answer and explanation

Correct answer: A. 4.5

  1. Step 1: Kc = [NH3] squared / ([N2][H2] cubed).
  2. Step 2: Kc = 36/(1 x 8) = 4.5.
Answer
4.5.
Why not the others: 3, 18 and 0.222 do not fit.

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