If enthalpy of a reaction CH2Cl2 (g) --- C (g) + 2H (g) + 2Cl (g) is 1482 kJ/mol and bond dissociation enthalpy of (C-H) bond is 415 kJ/mol than bond dissociation enthalpy of (C-Cl) bond is

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CH2Cl2(g)  C(g) + 2H(g)+ 2Cl(g)    Hrxn=1482 kJ/mol Hrxn=2HBE(C-H)+2HBE(C-Cl)or, 1482=2×415+2HBE(C-Cl)or, HBE(C-Cl)=6522=326 kJ/molHence, bond dissociation enthalpy of C-Cl bond is 326 kJ/mol

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