Consider the equilibrium shown below. 

SO₂Cl₂(g)  ≡  SO₂(g)  +  Cl₂(g); Kc = 0.078 at 375 K

What is the equilibrium concentration of SO₂, if the initial concentration of SO₂Cl₂ is 1.0 M?
[SO₂] = 0.24 M