An equilibrium mixture of O2, SO2 and SO3 contains equal concentrations of SO2 and SO3.

Calculate the concentration of O2 if Kc = 270 for the reaction: 2 SO2 (g) + O2 (g) - 2 SO3 (0)

[O₂ (g) ] = 0.0037M

Explanation:

2SO₂ (g) + O₂ (g) = > 2SO₃ (g)

Conc: [SO₂ (g) ] [O₂ (g) ] [SO₃ (g) ] and [SO₂ (g) ] = [SO₃ (g) ]

Kc = [SO₃ (g) ]²/[O₂ (g) ][SO₂ (g) ]² = > Kc = 1/[O₂ (g) ] = 270 if [SO₂ (g) ] = [SO₃ (g) ]

∴ [O₂ (g) ] = (1/270) M = 0.0037M