From the following data :
Enthalpy of formation of `CH_(3)CN`=87.86 kJ/mol
Enthalpy of formation of `C_(2)H_(6)=-` 83.68 kJ/mol
Enthalpy of sublimation of graphite =719.65 kJ/mol
enthalpy of dissociation of nitrogen =945.58 kJ/mol
Enthalpy of dissociation of `H_(2) =` 435.14 kJ/mol
`C-H` bond enthalpy =414.22 kJ/mol
Calculate the bond enthalpy of (i) `C-C` , (ii) `C equiv N`

Explanation

(i) `343.08 , (ii) 891.2`