Question

Write the expression for the equilibrium constant, $K_c$ for each of the following reactions.
(i) $2NOCl\left(g\right)\rightleftharpoons 2NO\left(g\right)+{Cl}_2\left(g\right)$
(ii) ${2Cu\left({NO}_3\right)}_2\left(s\right)\rightleftharpoons 2CuO\left(s\right)+4{NO}_2\left(g\right)+O_2\left(g\right)$
(iii) ${CH}_3{COOC}_2{H}_5\left(aq\right)+H_{2}O\left(1\right)\rightleftharpoons {CH}_{3}COOH\left(aq\right)+C_2{H}_{5}OH\left(aq\right)$
(iv) ${Fe}^{3+}\left(aq\right)+3{OH}^{-}\left(aq\right)\rightleftharpoons {Fe\left(OH\right)}_3\left(s\right)$
(v) $I_2\left(s\right)+5F_2\rightleftharpoons 2I{F}_5$

Answer 1

(a) The expression for the equilibrium constant is $K_c=\frac{\left[NO{]}^2\right[C{l}_2]}{[NOCl{]}^2}$.
(b) The expression for the equilibrium constant is $K_c=\left[N{O}_2{]}^4\right[O_2]$.
(c) The expression for the equilibrium constant is $K_c=\frac{\left[C{H}_{3}COOH\right]\left[C_2{H}_{5}OH\right]}{\left[C{H}_{3}COO{C}_2{H}_5\right]}$.
(d) The expression for the equilibrium constant is $K_c=\frac{1}{\left[F{e}^{3+}\right][O{H}^{-}{]}^3}$.
(e) The expression for the equilibrium constant is $K_c=\frac{[I{F}_5{]}^2}{[F_2{]}^5}$.