The reaction is as Follow,
2 SO₂ + O₂ ⇄ 2 SO₃ ΔH = -94.58 kJ mol⁻¹
Changing Concentration:
According to Le Chatelier's principle, the removal of SO₂ and O₂ (or decrease in their concentration) at equilibrium will result in decrease in the formation of SO₃.
Changing Pressure:
As the reaction proceeds by the decrease in volume, so by decreasing the pressure will shift the equilibrium in backward direction decreasing the concentration of product.
Changing Pressure:
Since the forward reaction is exothermic, the equilibrium will be shifted in backward direction by increasing the temperature.
