A 1.000 L vessel is ?lled with 1.000 mole of N2 , 2.000 moles of H2 , and 3.000 moles of NH3 .
When the reaction
N2 (g) + 3 H2 (g) ?? 2 NH3 (g)
comes to equilibrium, it is observed that the concentration of NH3 is 2.39 moles/L. What is the numerical value of the equilibrium constant Kc?