What is the effect of a change in volume on a chemical reaction that includes gaseous reactants or products initially at equilibrium?
a) It always shifts the equilibrium towards the side with fewer moles of gas.
b) It always shifts the equilibrium towards the side with more moles of gas.
c) It depends on the specific reaction and the change in volume; the equilibrium will shift to counteract the change in pressure.
d) It has no effect on the equilibrium of the reaction.