| Condition | Haber's process | Contact process |
|---|---|---|
| Principle equation |
N2(g)+ 3H2(8) ⇌ 2NH3(g)
(1 Vol) (3 Vols) (2 Vols)
ΔH° = –46.1 kJ mol–1
|
2S02(g)+ 02(8) ⇌ 2S03(g)
(2 Vols) (1Vol) (2 Vols)
ΔH° = –196.6 kJ mol–1
|
| Nature of reaction | Exothermic reaction | Exothermic reaction |
| Temperature | Since the forward reaction Is exothermic, a decrease In temperature (723 K) Is favored. | Since the forward reaction Is exothermic, a decrease In temperature (720 K) Is favored. |
| Pressure | 202.65 bar | 2 bar |
| Catalyst | Iron with Molybdenum as promoter | Vanadium pent–oxide |
| Number of moles Involved |
Number of moles of gaseous components Involved in forward reaction,
Δn = Vol. of products – Vol of reactants
=(2)–(1+3)
= –2 (indicates a decrease in volume by 2 units)
|
Number of moles of gaseous components Involved in forward reaction,
Δn = Vol. of products – Vol. of reactants
=(2)–(2+1)
= –1 (indicates a decrease in volume by 1 unit)
|