Alkenes — practice question

Ethene combines with hydrogen to produce ethane. The bond energies are listed in the table. Calculate the enthalpy change for this reaction.

• A$-290\ \text{kJ/mol}$
• B$-120\ \text{kJ/mol}$
• C$+120\ \text{kJ/mol}$
• D$+290\ \text{kJ/mol}$