If bond dissociation energy of H Cl and HCI is 10 20 and 60 kcal mol respectively then what is the enthalpy of formation of HCI

Question

If bond dissociation energy of H Cl and HCI is 10 20 and 60 kcal mol respectively then what is the enthalpy of formation of HCI 45 kcal mol kcal mol Which elements are 3 90 2 45 4 90 kcal mol kcal mol oxidised and reduced

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