The enthalpy of formation of ethane ( ( C ₂ H ₆ ) ) from ethylene by addition of hydrogen where the bond-energies of ( C - H , C - C , C = C , H - H ) are (414 ~kJ , 347 ~kJ , 615 ~kJ ) and (435 ~kJ ) respectively is ( ) ( kJ )

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Correct answer: 125

aligned & C ₂ H ₄( ~g )+ H ₂( ~g ) C ₂ H ₆( ~g ) & H = BE ( C = C )+4 BE ( C - H )+ BE ( H - H ) & - BE ( C - C )-6 BE ( C - H ) & H = BE ( C = C )+ BE ( H - H )- BE ( C - C ) & -2 BE ( C - H ) & =615+435-347-2 414 & =-125 ~kJ aligned

The enthalpy of formation of ethane ( ( C ₂ H ₆ ) ) from ethylene by addition of hydrogen where the bond-energies of ( C - H , C - C , C = C , H - H ) are (414 ~kJ , 347 ~kJ , 615 ~kJ ) and (435 ~kJ ) respectively is ( ) ( kJ )

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