Question

What is a Haber's process?

Answer 1

• The Haber process is used for the manufacture of ammonia gas.
• In this process, molecular hydrogen combines with nitrogen gas from the air, in the presence of powdered iron and little amount of molybdenum at$450°\mathrm{C}$ and 200 atmospheric pressure to form ammonia gas.

${\mathrm{N}}_2\left(\mathrm{g}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)\underset{450°\mathrm{C},200\mathrm{atm}}{\overset{\mathrm{Mo}}{\to }}2\underset{\mathrm{Ammonia}}{{\mathrm{NH}}_3\left(\mathrm{g}\right)}$

• This is an exothermic reaction i.e. heat evolved in this reaction. The heat evolved is 92.4kJ i.e. ΔH = - 92.4 kJ.