The bond dissociation energy of a carbon-carbon single bond in ethane C2H6 is approximately 348 kJ/mol. In comparison, the bond dissociation energy of a carbon-carbon double bond in ethene C2H4 is approximately 612 kJ/mol. This means that the carbon-carbon double bond in ethene is stronger than the carbon-carbon single bond in ethane, and it requires more energy to break the double bond than the single bond.