Chapter 9.6, Problem 37PP

Classify each of the following as exothermic or endothermic, and give the $\Delta$ H for each:

$\begin{array}{l}a.C{H}_4\left(g\right)+2O_2\left(g\right) \stackrel{\Delta }{\to }C{O}_2\left(g\right)+2H_{2}O\left(g\right)+802\text{ kJ}\\ \begin{array}{l}b.Ca{\left(OH\right)}_2\left(s\right)+65.3kJ\to CaO\left(s\right)+{\text{ H}}_{\text{2}}O\left(l\right)\hfill \\ c.2A1\left(s\right)+F{e}_2{O}_3\left(s\right)\to A{1}_2{O}_3\left(s\right)+2Fe\left(l\right)+850\text{ kJ}\hfill \end{array}\end{array}$