When chlorine reacts with ethane, chloroethane and hydrogen chloride are formed. This reaction is exothermic. The bond energies are listed in the table. What is the energy change for this reaction?
- A$-1420\,\text{kJ mol}^{-1}$
- B$-120\,\text{kJ mol}^{-1}$
- C$+120\,\text{kJ mol}^{-1}$
- D$+1420\,\text{kJ mol}^{-1}$