Question

Gaseous ammonia was introduced into a sealed container and heated to a certain temperature:
2NH3(g) ⇔ N2(g) + 3H2(g)
At equilibrium, [NH3] = 0.0406 M, [N2] = 0.126 M, and [H2] = 0.208 M.
Calculate Keq for the reaction at this temperature.