The following standard enthalpy change of formation values are supplied. $\Delta H_f^\circ[\text{VCl}_2] = -452\,\text{kJ mol}^{-1}$ and $\Delta H_f^\circ[\text{VCl}_3] = -573\,\text{kJ mol}^{-1}$. What is the enthalpy change for the reaction $3\text{VCl}_2 \rightarrow 2\text{VCl}_3 + \text{V}$?
- A$-210\,\text{kJ mol}^{-1}$
- B$-121\,\text{kJ mol}^{-1}$
- C$+121\,\text{kJ mol}^{-1}$
- D$+210\,\text{kJ mol}^{-1}$