For the forward direction of a reversible reaction, the enthalpy change of reaction, $\Delta H$, is $-50\,\text{kJ mol}^{-1}$ and the activation energy, $E_a$, is $+60\,\text{kJ mol}^{-1}$. What is the activation energy of the reverse reaction?
- A$-110\,\text{kJ mol}^{-1}$
- B$-10\,\text{kJ mol}^{-1}$
- C$+10\,\text{kJ mol}^{-1}$
- D$+110\,\text{kJ mol}^{-1}$