What is the expression for the equilibrium constant K for the reaction represented by the equation:
2 SO₃(g) ⇄ 2 SO₂(g) + O₂(g)
(a) [SO₂]² / [SO₃]²
(b) [SO₂]² / ([SO₂]² [O₂] [SO₃]²)
(c) [SO₃]² / ([SO₂]² [O₂])
(d) [SO₂]² / [O₂]
(e) None of these