Calculate $\Delta$ H $\degree$ For the Reaction $\mathrm{PCl}_{5}(g) \leftrightarrows \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)$ Given the Following Data

Calculate $\Delta$ H $\degree$ for the reaction $\mathrm{PCl}_{5}(g) \leftrightarrows \mathrm{PCl}_{3}(g)+\mathrm{Cl}_{2}(g)$ given the following data: