\(\Delta n = 1 - 2 = - 1\)
\({K_p} = {K_c}{[RT]^{\Delta n}}\); \(\therefore \,\,\,\frac{{{K_p}}}{{{K_c}}} = {[RT]^{ - 1}} = \frac{1}{{RT}}\)
${N_2}(g) + {O_2}(g) \rightleftharpoons 2NO(g)$
${N_2}{O_4}(g) \rightleftharpoons 2N{O_2}(g)$
${N_2}(g) + 3{H_2}(g) \rightleftharpoons 2N{H_3}(g)$