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4HCl(g)+O2(g)?2H2O(g)+2Cl2(g) Kc=357

An equilibrium mixture of the above system was found to contain the following concentrations: HCl(g) = 0.35 mol/L, O2(g) = 0.078 mol/L and H2O(g) =1.2 mol/L. The equilibrium concentration of Cl2(g) is calculated to be _______ mol/L

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