From the following bond energies : H − H bond energy : 431.37 kJ mol − 1 C = C bond energy : 606.10 kJ mol − 1 C - C bond energy : 336.49 kJ mol − 1 C − H bond energy : 410.50 kJ mol − 1 Enthalpy for

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From the following bond energies : H − H bond energy : 431.37 kJ mol − 1 C = C bond energy : 606.10 kJ mol − 1 C - C bond energy : 336.49 kJ mol − 1 C − H bond energy : 410.50 kJ mol − 1 Enthalpy for the reaction, will beNEET 2009 (Screening)

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Key Idea Enthalpy of reaction = ∑ BE Reactants ​ − ∑ BE Products ​ For reaction, ​ Δ H r ​ = [ 4 × BE ( C − H ) ​ + 1 × BE ( C = C ) ​ + 1 × BE ( H − H ) ​ ] − [ 6 × BE ( C − H ) ​ + 1 × BE ( C − C ) ​ ] = ( 4 × 410.50 + 1 × 606.10 + 1 × 431.37 ) − [( 6 × 410.50 ) + ( 1 × 336.49 )] = − 120.0 kJ mol − 1 ​

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