Chapter 5, Problem 65E

Calculate $\Delta H$ for the process ${\text{Hg}}_2{\text{Cl}}_2\left(s\right)\to 2\text{Hg}\left(l\right)+{\text{Cl}}_2\left(g\right)$ from the following information:

$\begin{array}{l}\text{Hg}\left(l\right)+{\text{Cl}}_2\left(g\right)\to {\text{HgCl}}_2\left(s\right)\Delta H=-224\text{kJ}\\ \text{Hg}\left(l\right)+{\text{HgCl}}_2\left(s\right)\to {\text{HgCl}}_2\left(s\right)\Delta H=-41.2\text{kJ}\end{array}$