If Kc Equals 0 11 At 298 K For The Reaction N2o4 G 2 No2 G What Is Kc For The Re

If Kc equals 0.11 at 298 K for the reaction: N2O4(g) 2 NO2(g), what is Kc for the reaction: NO2(g) 1/2 N2O4(g)?