Chapter 7.9, Problem 7.71PP

Classify each of the following as exothermic or endothermic:

a. ${\text{CH}}_{\text{4}}\left(g\right)+{\text{2O}}_{\text{2}}\left(g\right)\stackrel{\Delta }{\to }{\text{CO}}_{\text{2}}+{\text{ 2H}}_{\text{2}}\text{O}\left(g\right)+\text{802kJ}$
b. $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}\left(s\right)+65.\text{3kJ}\to \text{CaO}\left(s\right)+{\text{H}}_{\text{2}}\text{O}\left(l\right)$
c. $\text{2Al}\left(s\right)+{\text{ Fe}}_{\text{2}}{\text{O}}_{\text{3}}\left(s\right)\to {\text{Al}}_{\text{2}}{\text{O}}_{\text{3}}\left(s\right)+\text{2Fe}\left(s\right)+\text{850kJ}$