The reaction between nitrogen and hydrogen to form ammonia is an exothermic process in which the energy of products is lower than the energy of the reactants. Activation energy of the reaction, which is the energy change of a reaction from reactants to a product, is lowered in the presence of a catalyst. Following is the equation of Haber process:
N2(g) + 3H2(g) ⇌ 2NH3(g) + energy ΔH=−92.4kJ/mol
