Mention the conditions required to maximise the yield of ammonia

Explanation

`NH_3` is manufactured by haber'process.

In accordance with Le-Chatelier's principle, high pressure favours the formation of ammonia. The condition required to maximise the yield of ammonia are:
(i). pressure of `200xx10^5Pa` (200atm)
(ii). Temperature of `700K`
(iii). Catalyst such as `Fe_2O_3` with small amount of `K_2O` and `Al_2O_3`.