mention the conditions required to maximise …

For Habers process .... Finely divided Fe ,Mo, 200bar pressure and 723-773 K Temperature

Ammonia is prepared using the Haber’s process. The conditions required to maximize the yield of ammonia are as follows: 1 In accordance to Le Chatelier’s principle ,low temperature will shift the equilibrium to the right because the reaction is exothermic.This gives greater yield of ammonia.Therefore a temperature of about 450°C will be optimal for the preparation of ammonia. 2 High pressure on the reaction at equilibrium favours the shift of the equilibrium to the right because the forward reaction proceeds with a decrease in number of moles.Hence a pressure of about 200 atm will be optimal for the higher yield of ammonia. 3 A catalyst should be used to increase the rate of reaction & to quickly attain equilibrium.For eg as iron oxide mixed with small amounts of K2O and Al2O3 can be used as catalyst. 4 N2 & H2 gases should be pure in nature to increase the yield of ammonia.