How is ammonia manufactured by Haber's process ? Explain the reactions of ammonia with
`"ZnSO"_(4_(("aq")))`

Explanation

In Haber process ammonia is directly synthesised from elements (nitrogen and hydrogen). The principle involved in this is
`N_(2)(g)+3H_(2)(g) iff 2NH_(3)+92.4" kJ"`
This is a reversible exothermic reaction.
According to Le Chatelier's principle favourable conditions for the better yield of ammonia are low temperature and high pressure. But the optimum conditions are :
`{:("Temperature",,:,,720"k"),("Pressure",,:,,200" atmospheres"),("Catalyst",,:,,"Finely divided iron in the presence of molybdenum (Promoter)."):}`
Procedure : A mixture of nitrogen and hydrogen in the volume ratio 1 : 3 is heated to 725 - 775K at a pressure of 200 atmospheres is passed over hot finely divided iron mixed with small amount of molybdenum as promotor. The gases coming out of the catalyst chamber consists of `10-20%` ammonia gas are cooled and compressed, so that ammonia gas is liquified, and the uncondensed gases are sent for recirculation.

Aq. `"ZnSO"_(4)` reacts with ammonia aqueous solution to form white ppt of Zinc hydroxide.
`NH_(3_(("aq")))+H_(2)O_((l))iffNH_(4("aq"))^(+)+OH_(("aq"))^(+)`
`"ZnSO"_(4("aq"))^(+)+2"NH"_(4)"OH"_(("aq"))to underset("white ppt")("Zn(OH)"_(2_((s)))+(NH_(4))_(2)"SO"_(("aq"))`