Industrially ammonia is manufactured by Haber’s process.
N2(g)+3H2(g)→2NH3(g);
ΔfH0=−46.1 kJ∕mol
In accordance with Le-Chatelier’s principle, high pressure and lowtemperature would favourthe formation of ammonia. The optimumconditions for production of ammonia are a pressure of 200 × 10‌5Pa(about 200 atm), a temperature of ~700 K and the use of a catalyst suchas iron-oxide with small amounts of K2O and Al2O3 to increase therate ofattainment of equilibrium.