The key reaction in the Contact Process for the manufacture of Sulphuric acid is the oxidation of SO₂ to SO₃. 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ΔH = -192kJ/mol. State and explain how the yield of SO₃ is increased in practice. How is SO₃ converted to sulphuric acid?

here are the answers to your questions:

QUESTION 1

c) The key reaction in the Contact Process for the manufacture of Sulphuric acid is the oxidation of SO$_2$ to SO$_3$

$$2\text{SO}_2(\text{g}) + \text{O}_2(\text{g}) \rightleftharpoons 2\text{SO}_3(\text{g}) \quad \Delta H^\circ = -192 \text{ kJ/mol}$$

• i. State and explain how the yield of SO$_3$ is increased in practice.
  • High pressure: Increasing the pressure shifts the equilibrium to the right, favoring the side with fewer moles of gas (