Question

What is the bond enthalpy of the carbon-carbon double bond (C=C) in ethene (C2H4) when 120 kJ/mol of energy is required to break the bond?

Answer 1

The bond enthalpy of the carbon-carbon double bond  C=C  in ethene  C2H4  is the amount of energy required to break the bond. In this case, it is given that 120 kJ/mol of energy is required to break the bond. Therefore, the bond enthalpy of the C=C bond in ethene is 120 kJ/mol.