2 NO2(g) <-> N2O4(g) (dark brown to colorless) The dimerization of NO2(g), an exothermic process, is — Equilibrium Chemistry Question

2 NO₂(g) <-> N₂O₄(g) (dark brown to colorless)

The dimerization of NO₂(g), an exothermic process, is represented by the equation above. A 0.0300 mol sample of NO₂(g) is placed in a rigid 1.00 L reaction vessel and allowed to reach equilibrium at a certain temperature. What is the value of Kc at this temperature if 0.00500 mol of N₂O₄(g) is present at equilibrium?