A vessel of 1.000 L is filled with 1.000 mole of H2, 2.000 moles of N2, and 2.000 moles of Ammonia. Concentration of H2 is observed 2.15 moles/L When the reaction N2(g) + 3 H2(g) ?? 2 NH3(g) comes to equilibrium. Determine the numerical value of the Kc equilibrium constant?