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Calculate the bond energy of Cl-Cl bond ...

Calculate the bond energy of `Cl-Cl` bond from the following data:
`CH_(4)(g)+Cl_(2)(g)rarrCH_(3)Cl(g)+HCl(g), Delta H= -100.3 kJ`. Also the bond enthalpies of `C-H, C-Cl,H-Cl` bonds are `413,326` and `431 kJ mol^(-1)` respectively.

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