If helium is introduced in a reactor containing O2, SO2 and SO3 at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO3 (as per Le Chatelier’s principle)?

Question

Accepted Answer

Decreases. Adding an inert gas like helium increases the total pressure without changing partial pressures. This shift favors the side with more moles of gas to reduce the pressure change.