For PCl5(g) <-> PCl3(g) + Cl2(g) at constant temperature, the forward reaction is favoured by:

adding an inert gas at constant volume
adding chlorine gas at constant volume
adding an inert gas at constant pressure
adding PCl5 at constant volume

Correct answer: adding an inert gas at constant pressure

Solution

Adding inert gas at constant pressure expands the volume, decreasing concentrations and shifting equilibrium toward the side with more gas moles (products).

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