Write the expression for the equilibrium constant, \mathrm{K}_{\mathrm{c}} for each of the following reactions: (i) 2 \mathrm{NOCl}(g) \leftrightarrow 2 \mathrm{NO}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{~g}) (ii) 2 \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{~s}) \leftrightarrow 2 \mathrm{CuO}(\mathrm{s})+4 \mathrm{NO}_{2}(g)+\mathrm{O}_{2}(g)
Write the expression for the equilibrium constant, \mathrm{K}_{\mathrm{c}} for each of the following reactions: (i) 2 \mathrm{NOCl}(g) \leftrightarrow 2 \mathrm{NO}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{~g}) (ii) 2 \mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}(\mathrm{~s}) \leftrightarrow 2 \mathrm{CuO}(\mathrm{s})+4 \mathrm{NO}_{2}(g)+\mathrm{O}_{2}(g)

Answer:

The equilibrium constant, Kc, is defined as the product of the equilibrium concentrations of products over the equilibrium concentrations of reactants, each raised to the power of the stoichiometric coefficients of the reactants and products.

(i) K_{C}=\frac{\left[N O_{g}\right]^{2}\left[C l_{2(g)}\right]}{\left[N O C l_{(g)}\right]^{2}}

(ii) K_{C}=\frac{\left[\mathrm{CuO}_{(s)}\right)^{2}\left[\mathrm{NO}_{2_{(g)}}\right)^{4}\left[O_{2(g)}\right]}{\left[C u\left(N O_{3}\right)_{2(g)}\right)^{2}}

=\left[N O_{2(g)}\right]^{4}\left[O_{2(g)}\right]