As pressure rises, the equilibrium will move to the side of the reaction where there are less moles of gas. When the pressure drops, the equilibrium will move to the side of the process where there are more gas molecules.
According to Le Chatelier's principle, a pressure change will cause an equilibrium to shift to the reaction's side that has the fewest moles of gas, while a pressure change will cause it to shift to the reaction's side that has the most moles of gas.
Pressure reduction shifts the equilibrium to the side with the majority of molecules. This lessens the effects of the change because as the number of molecules increases, so does the pressure.
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