Among the exothermic steps in the manufacture of sulfuric acid is the process of hydrating SO₃. The two chemical reactions that show this process are :
1. Reversible Reaction and Exothermic :
2SO₂(g) + O₂(g) ⇔ 2SO₃(g)
2. The Forward Reaction :
2SO₃(g) + O₂(g) ⇔ 2SO₃(g)
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