A-LevelChemistryEquilibria9701/12 · May/June 2011 · Q51 Mark
Ammonia is manufactured on a large scale by the Haber process. In a particular plant, conditions of 400 °C and 250 atm in the presence of an iron catalyst are used. N2(g) + 3H2(g) ⇌ 2NH3(g) ΔH° = −92 kJ mol⁻¹ What could contribute most to increasing the equilibrium yield of ammonia?
Aadding more catalyst
Bincreasing the pressure to 400 atm
Cincreasing the temperature to 1000°C
Dusing air rather than nitrogen
✓ Correct answer
B: increasing the pressure to 400 atm
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