Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine.         CCl4(g) + (1/2)O2(g)    <-->    COCl2(g) + Cl2(g),           Kc = 4.4 x 109 at 1,000 K Calculate Kc for the reaction 2CCl4(g) + O2(g)     <-->     2COCl2(g) + 2Cl2(g).    (2 sig figs)

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