N2+3H2⇌2NH3;
∆fH=– 46.1kJmol–1
In accordance with Le Chatelier’s principle high pressure and lowtemperature would favour formation of ammonia. The optimumconditions for the production of ammonia are a pressure of about200 atm, a temperature of about 700K and use of a catalyst such as ironoxide with small amount of K2O and Al2O3 as promoters.