Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. CCl4(g)+21O2(g)COCl2(g)+Cl2(g),Kc=4.4109 at 1,000K Calculate Kc for the reaction 2CCl4(g)+O2(g)2COCl2(g)+2Cl2(g). a) 4.4109 b) 8.8109 c) 1.91019 d) 2.31010 e) 1.91010