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12. The Haber process involves the following reaction: N2 (9) + 3H2 (9) = 2NH3(g) N2 and H2 in the mole ratio of 1:3 were mixed in a closed container and allowed to achieve equilibrium at 450 C. The equilibrium mixture was found to contain 15% of ammonia and the total pressure in the container is 10 atm. Calculate the equilibrium constant, K, of the reaction. (Answer: Kp = 4.11 x 10)