1.

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.

Answer» Correct Answer - `243.7 kJ mol^(-1)`
`Delta H= 4 Delta H_(C-H)+DeltaH_(Cl-Cl)-3 Delta H_(C-H)-Delta H_(H-Cl)`
`= -100.3=(4xx413)+x-(3xx413)-326-431`
`x= 243.7 KJ mol^(-1)`


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