Consider the following equilibrium: 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) Which of the following is a correct equilibrium expression?
a. Keq=[SO₃][SO₂][O₂]
b. Keq=[SO₃]₂[SO₂]₂[O₂]
c. Keq=[SO₂][O₂][SO₃]
d. Keq=[SO₂]₂[O₂][SO₃]₂