Chapter 17, Problem 28QAP

. Indicate whether the stated equilibrium expression is correct for each of the following heterogeneous equilibria. For those expressions that are not correct, provide the correct expression along with an explanation.

a. $2{\text{NBr}}_{\text{3}}\left(s\right)\rightleftharpoons {\text{N}}_2\left(g\right){\text{+3Br}}_{\text{2}}\left(g\right),K=\frac{\left[{\text{N}}_2\right]{\left[{\text{Br}}_{\text{2}}\right]}^3}{{\left[{\text{NBr}}_{\text{3}}\right]}^2}$

b. $\text{CuO}\left(s\right)+{\text{H}}_2\left(g\right)\rightleftharpoons \text{Cu}\left(l\right){\text{+H}}_2\text{O}\left(g\right),K=\frac{\left[\text{Cu}\right]\left[{\text{H}}_{\text{2}}\text{O}\right]}{\left[{\text{H}}_{\text{2}}\right]}$

c. $\text{4Fe}\left(s\right)+3{\text{O}}_2\left(g\right)\rightleftharpoons {\text{2Fe}}_2{\text{O}}_{\text{3}}\left(s\right),K=\frac{\text{1}}{{\left[{\text{O}}_{\text{2}}\right]}^3}$