The second step in the production of sulphuric acid is given by the equation:
2SO2(g) + O2(g) → 2SO3(g)
Which conditions would increase the yield of this reaction?
The given reaction is an exothermic reaction (heat is evolved). Raising the temperature too much can lead to the heat released in this exothermic reaction. The yield is decreased at high temperatures. Therefore, in this reaction lower temperatures and higher pressure favour the high yield of SO3(sulphur trioxide).