Chapter 6, Problem 6.45P

Calculate $\text{Δ}\text{H}$ for $2\text{N}\text{O}\text{C}\text{l}(g)\to {\text{N}}_2(g)+{\text{O}}_2(g)+\text{C}{\text{l}}_2(g)$ given the following reactions: $\frac{1}{2}{\text{N}}_2(g)\to \frac{1}{2}{\text{O}}_2(g)\to \text{N}\text{O}(g)$ $\text{Δ}\text{H}=90.3\text{ kJ}$ $\text{C}\text{a}\text{C}{\text{O}}_3(s)\to \text{C}\text{a}\text{O}(s)+\text{C}{\text{O}}_2(g)$ $\text{Δ}\text{H}=-38.6\text{ kJ}$