At a certain temperature the following redox reaction is at equilibrium in aqueous…

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

At a certain temperature the following redox reaction is at equilibrium in aqueous solution. 2MnO4−(aq)+6H+(aq)+5C2O42−(aq)⇌2Mn2+(aq)+10CO2(g)+8H2O(l)2\text{MnO}_4^-(aq)+6\text{H}^+(aq)+5\text{C}_2\text{O}_4^{2-}(aq)\rightleftharpoons2\text{Mn}^{2+}(aq)+10\text{CO}_2(g)+8\text{H}_2\text{O}(l) Which of the following expressions is correct for KcK_c for this equilibrium? (a) Kc=[Mn2+]2[CO2]10[H2O]8[MnO4−]2[H+]6[C2O42−]5K_c=\dfrac{[\text{Mn}^{2+}]^{2}[\text{CO}_2]^{10}[\text{H}_2\text{O}]^{8}}{[\text{MnO}_4^-]^{2}[\text{H}^+]^{6}[\text{C}_2\text{O}_4^{2-}]^{5}} (b) Kc=[Mn2+]2[CO2]5[MnO4−]2[H+]6[C2O42−]5K_c=\dfrac{[\text{Mn}^{2+}]^{2}[\text{CO}_2]^{5}}{[\text{MnO}_4^-]^{2}[\text{H}^+]^{6}[\text{C}_2\text{O}_4^{2-}]^{5}} (c) Kc=[Mn2+]2[CO2]10[MnO4−]2[H+]6[C2O42−]5K_c=\dfrac{[\text{Mn}^{2+}]^{2}[\text{CO}_2]^{10}}{[\text{MnO}_4^-]^{2}[\text{H}^+]^{6}[\text{C}_2\text{O}_4^{2-}]^{5}} (d) Kc=[Mn2+]2[CO2]10[MnO4−]2[C2O42−]5K_c=\dfrac{[\text{Mn}^{2+}]^{2}[\text{CO}_2]^{10}}{[\text{MnO}_4^-]^{2}[\text{C}_2\text{O}_4^{2-}]^{5}}

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