When mixture of N2 gas and H2 gas (1 : 3) is heated ammonia gas is a obtained.
The above reaction is reversible, exothermic and decrease in volume occur. Thus applying Le Chatelier’* principle for greater production of ammonia gas.
(i) There is decrease in volume in reaction. Hence increase in pressure, shifts the equilibrium towards forward direction i.e. production of NH3 increases at high pressure.
(ii) This reaction is exothermic. Hence at low temperature, production of NH3 should increase. But at lower temperature N2 & H2 do not react.
So, at optimum temperature (400–450°C) catalyst is applied.
