The reaction of hydrogen chloride(g) with oxygen(g) to form water(g) and chlorine(g) proceeds as follows:   4 HCl(g) + O2(g) -----> 2 H2O(g) + 2 Cl2(g)   When 13.7 grams of HCl(g) react with sufficient O2(g) , 10.7 kJ of energy are evolved . What is the value of H for the chemical equation given?   ΔHrxn =  kJ

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