The energy profile shows a chemical reaction taking place both in the presence of a catalyst and in its absence. What is the enthalpy change for the catalysed reaction?
- A$-125\,\text{kJ mol}^{-1}$
- B$-50\,\text{kJ mol}^{-1}$
- C$+75\,\text{kJ mol}^{-1}$
- D$+100\,\text{kJ mol}^{-1}$