• # question_answer If concentrations are expressed in moles ${{L}^{-1}}$ and pressures in atmospheres, what is the ratio of ${{K}_{p}}$ to ${{K}_{c}}$ for the reaction : $2S{{O}_{2}}(g)+{{O}_{2}}(g)\rightleftharpoons 2S{{O}_{3}}(g)$at $25{}^\circ C$?

$\Delta \,{{n}_{g}}={{n}_{p}}-{{n}_{r}}=-1$. Hence, ${{K}_{p}}={{K}_{c}}{{(RT)}^{-1}}$ or ${{K}_{p}}/{{K}_{c}}=1/RT=\frac{1}{0.0821\times 298}=0.04$