Chapter 12, Problem 40E

Calculate △G ° for each of the following reactions from the equilibrium constant at the temperature given.

(a) ${\text{Cl}}_2\left(g\right)+{\text{Br}}_2\left(g\right)\to 2\text{BrCl}\left(g\right)$ $\text{T}=25°\text{C}$ $K_{\text{p}}=4.7\times {10}^{-2}$

(b) ${\text{2SO}}_2\left(g\right)+{\text{O}}_2\left(g\right)\rightleftharpoons 2{\text{SO}}_3\left(g\right)$ $\text{T}=500°\text{C}$ $K_{\text{p}}=48.2$

(c) ${\text{H}}_2\text{O}\left(l\right)\rightleftharpoons {\text{H}}_2\text{O}\left(g\right)$ $\text{T}=60°\text{C}$ $K_{\text{p}}=0.196\text{atm}$

(d) $\text{CoO}\left(s\right)+\text{CO}\left(g\right)\rightleftharpoons \text{CO}\left(s\right)+{\text{CO}}_2\left(g\right)$ $\text{T}=550°\text{C}$ $K_{\text{p}}=4.90\times {10}^2$

(e) ${\text{CH}}_3{\text{NH}}_2\left(aq\right)+{\text{H}}_2\text{O}\left(l\right)\to {\text{CH}}_3{\text{NH}}_3{}^{+}\left(aq\right){\text{+OH}}^{-}\left(aq\right)$ $\text{T}=25°\text{C}$ $K_{\text{p}}=4.4\times {10}^{-4}$

(f) ${\text{PbI}}_2\left(s\right)\to {\text{Pb}}^{2+}+2{\text{I}}^{-}\left(aq\right)$ $\text{T}=25°\text{C}$ $K_{\text{p}}=8.7\times {10}^{-9}$