In this reaction,

Question

2SO2(g) + O2(g) ⇌ 2SO3(g) + Heat

Adding SO3(g) will

shift equilibrium right
shift equilibrium left
increase the temperature
have no effect

Answer 1

Adding SO3(g) to the reaction will shift the equilibrium to the left. According to Le Chatelier's principle, adding more product will shift the equilibrium in the direction that consumes the product, in this case towards the reactants - SO2(g) and O2(g).