What happens to the equilibrium 2so2(g)+o2(g)⇋2so3(g) if the volume of the system is increased?

Based on Le Chatelier's principle, if the equilibrium of a given reaction is disturbed through changes in temperature, pressure, volume or concentration, then it will shift in a direction so as to undo the effect of the change induced.

The given reaction is:

2SO2(g) + O2(g) ↔ 2SO3(g)

As per Boyle's law,

V α 1/P

as the volume is increased the pressure of the system would decrease. The equilibrium would then shift in a direction of increased pressure. This would be towards the reactants where there are more moles of the gas.

Therefore, the equilibrium would shift to the left towards the reactants.

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