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The equilibrium SO2Cl2(g) = SO2(g) + Cl2(g) is established at 25 deg C in a closed rigid (constant-volume) vessel, and then inert helium gas is added. Which statement is correct?

1. concentrations of SO2, Cl2 and SO2Cl2 do not change
2. more chlorine is formed
3. concentration of SO2 is reduced
4. more SO2Cl2 is formed

Correct answer: concentrations of SO2, Cl2 and SO2Cl2 do not change

Solution

At constant volume, adding helium leaves the concentrations and partial pressures of all reacting species unchanged, so the equilibrium does not shift.

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