5.3 Exercise 25

Calculate $\Delta H °$ for the process
$\text{Sb} \left(s\right) + \frac{5}{2} \text{Cl}_{2} \left(g\right) \rightarrow \text{SbCl}_{5} \left(s\right)$

from the following information:
$\begin{matrix} \\ \text{Sb} \left(s\right) + \frac{3}{2} \text{Cl}_{2} \left(g\right) \rightarrow \text{SbCl}_{3} \left(s\right) \Delta H ° = −314 \text{kJ} \\ \text{SbCl}_{3} \left(s\right) + \text{Cl}_{2} \left(g\right) \rightarrow \text{SbCl}_{5} \left(s\right) \Delta H ° = −80 \text{kJ}\end{matrix}$