$N_2 + 3H_2 $ $\rightleftharpoons$ $ Z_{(g)}\,\, 2NH_{3(g)} ; \,\,k_1\,\,, N_2 + O_2 $ $\rightleftharpoons$ $ 2NO \,\,; k_2 \,\,, H_2 +$ $\frac{1}{2}$ $O_2$ $\rightleftharpoons$ $H_2O$ ; $k_3$ તો પ્રક્રિયા $2NH_3$ $+$ $\frac{5}{2}$$O_2$ $\rightleftharpoons$ $2NO$ $+$ $3H_2O$ નો સંતુલન અચળાંક $k_1 , k_2$ અને $k_3$ ના રૂપમાં.....
$N_2 + O_2 ⇌ 2NO , \,\,k' = k_2$
$3H_2 +$ $\frac{5}{2}{O_2}$ $ \rightleftharpoons $ $3H_2O \,\,, k'' = (k_3)^3$
$2NH_3 +$$\frac{5}{2}{O_2}$ $ \rightleftharpoons $ $2NO + 3H_2O$
$K = k \times k' \times k''$
$\therefore \,\,k\,\, = \,\,\frac{1}{{{k_1}}}\,\, \times \,\,{k_2}\,\, \times \,\,{({k_3})^3}\, = \,\,\frac{{{k_2}{{({k_3})}^3}}}{{{k_1}}}$
$X:2S{O_2} + {O_2} \rightleftharpoons 2S{O_3}$
$Y:PC{l_5} \rightleftharpoons PC{l_3} + C{l_2}$
$Z:2HI \rightleftharpoons {H_2} + {H_2}$