sulfur dioxide + oxygen --> sulfur trioxide (equilibrium position to the right)
2SO2(g) + O2(g) --> 2SO3(g)
Conditions for contact process:
- 450c - forward reaction is exothermic so high temp drives equilibrium to the left, high temp = faster reaction
- atmospheric pressure - high pressure increases yield and drives equilibrium further to the right
- vanadium catalyst - catalysts speed up reaction
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