Q. From the following data, calculate the bond enthalpies of $C - C$ (in $k J$ ) Enthalpy of formation of $C H_{3} CN = 87.86$ , Enthalpy of formation of $C_{2} H_{6} = - 83.68$ . Enthalpy of transition of graphite to diamond $= 1.8$ , Bond enthalpy of $C - C$ bond in diamond $= 358.92$ Enthalpy of dissociation of $N_{2} = 945.58$ , Enthalpy of dissociation of $H_{2} = 435.14$ Bond enthalpy of $C - H$ bond $= 414.22$ [All data in $k J m o l^{- 1}$ ]

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Answer: 343.08