Mention the conditions required to maximise the yield of ammonia.

Explanation

Ammonia is prepared by the Haber's process

In accordance with Le Chateler's principle, to maximize the yield, a high pressure of `200xx10^(5) Pa` is used. To increase the rate of the reaction, a temperature of around `700 K` is used and iron oxide mixed with some `K_(2)O` and `Al_(2)O_(3)` is used as a catalyst. Sometimes, `Mo` is also used as a promoter to increase the efficiency of the `Fe` catalyst.