Chlorine combines with ethane to form chloroethane and hydrogen chloride. $\text{C}_2\text{H}_6 + \text{Cl}_2 \rightarrow \text{C}_2\text{H}_5\text{Cl} + \text{HCl}$ This reaction gives out heat. The bond energies are listed in the table below. C-Cl: $+340\,\text{kJ mol}^{-1}$ C-C: $+350\,\text{kJ mol}^{-1}$ C-H: $+410\,\text{kJ mol}^{-1}$ Cl-Cl: $+240\,\text{kJ mol}^{-1}$ H-Cl: $+430\,\text{kJ mol}^{-1}$ Calculate the energy change for the reaction.
- A$-1420\,\text{kJ mol}^{-1}$
- B$-120\,\text{kJ mol}^{-1}$
- C$+120\,\text{kJ mol}^{-1}$
- D$+1420\,\text{kJ mol}^{-1}$