Chapter 9.6, Problem 42PP

Calculate the energy change for the reaction
$\begin{array}{l}F{e}_2{O}_3\left(s\right)+CO\left(g\right)\to 2FeO\left(s\right)+C{O}_2\left(g\right)fromthefollowing:\hfill \\ F{e}_2{O}_3\left(s\right)+3CO\left(g\right)\to 2Fe\left(s\right)\pm 3C{O}_2\left(g\right)\Delta H=—23.4\text{ kJ}\hfill \\ FeO\left(s\right)+CO\left(g\right)\to Fe\left(s\right)+C{O}_2\left(g\right)\Delta \text{H}=\text{ -}10.9\text{ kJ}\hfill \end{array}$