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Enthalpy of polymerisation of ethylene, ...

Enthalpy of polymerisation of ethylene, as represented by the reaction ,
`Q : N_(2)(g)+2O_(2)(g)toN_(2)O_(4)(g),DeltaH_(Q)=2.31kcal` is `-100` kJ per mole of ethylene. Given bond enthalpy of `C=C` bond is 600 kJ `mol^(-1)`, enthalpy of `C-C` bond (in kJ mol) will be :

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