At a certain temperature, 0.880 mol SO30.880 mol SO3 is placed in a 2.50 L2.50 L container.   2SO3(g)↽−−⇀2SO2(g)+O2(g)2⁢SO3⁢(g)⁢↽−−⇀⁢2⁢SO2⁢(g)+O2⁡(g)   At equilibrium, 0.120 mol O2 is present. Calculate ?c.Kc. ?c=Kc=

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