Ammonia is produced on a large scale by means of the Haber process. In one specific plant, a temperature of $400\,^{\circ}\text{C}$ and a pressure of $250\,\text{atm}$ are applied together with an iron catalyst. $\text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g) \qquad \Delta H^{\circ} = -92\,\text{kJ mol}^{-1}$ What change could make the greatest contribution to a higher equilibrium yield of ammonia?
- Aadding more catalyst
- Bincreasing the pressure to $400\,\text{atm}$
- Cincreasing the temperature to $1000\,^{\circ}\text{C}$
- Dusing air rather than nitrogen