5.3 Exercise 27

Calculate ΔH for the process $\text{Hg}_{2} \text{Cl}_{2} \left(s\right) \rightarrow 2 \text{Hg} \left(l\right) + \text{Cl}_{2} \left(g\right)$

from the following information:
$\begin{matrix}\text{Hg} \left(l\right) + \text{Cl}_{2} \left(g\right) \rightarrow \text{HgCl}_{2} \left(s\right) \Delta H = −224 \text{kJ} \\ \text{Hg} \left(l\right) + \text{HgCl}_{2} \left(s\right) \rightarrow \text{Hg}_{2} \text{Cl}_{2} \left(s\right) \Delta H = −41.2 \text{kJ}\end{matrix}$