To calculate the equilibrium constant Kc for the reaction, we can use the expression:Kc = [NH3]^2 / [N2] * [H2]^3 where the concentrations are given in molarity M .Given the equilibrium concentrations of N2, H2, and NH3 are 0.25 M, 0.75 M, and 0.50 M, respectively, we can plug these values into the expression:Kc = 0.50 ^2 / 0.25 * 0.75 ^3 Kc = 0.25 / 0.25 * 0.421875 Kc = 0.25 / 0.10546875Kc 2.37So, the equilibrium constant Kc for the reaction is approximately 2.37.