Final answer:
If SO₂ is added to the reaction 2SO₃(g) + 45 kJ ↔ 2SO₂(g) + O₂(g), the equilibrium will shift to the right.
Step-by-step explanation:
If SO₂ is added to the reaction 2SO₃(g) + 45 kJ ↔ 2SO₂(g) + O₂(g), the equilibrium will shift to the right. This is because the addition of SO₂, which is a reactant, will disrupt the equilibrium and cause the reaction to proceed in the forward direction to consume the added SO₂ and restore the equilibrium. As a result, more products will be produced, shifting the equilibrium to the right.