At 500 K the equilibrium constant for the reaction is .

CHEMISTRY · Multi-part · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

At 500 K the equilibrium constant for the reaction H2(g)+I2(g)  ⇌  2 HI(g)\text{H}_2(g)+\text{I}_2(g)\;\rightleftharpoons\;2\,\text{HI}(g) is Kc=50.5K_c=50.5. (a) Determine the value of KcK_c for the chemical equation 12 H2(g)+12 I2(g)  ⇌  HI(g)\tfrac12\,\text{H}_2(g)+\tfrac12\,\text{I}_2(g)\;\rightleftharpoons\;\text{HI}(g) at the same temperature. (b) Determine the value of KcK_c for the chemical equation 3 H2(g)+3 I2(g)  ⇌  6 HI(g)3\,\text{H}_2(g)+3\,\text{I}_2(g)\;\rightleftharpoons\;6\,\text{HI}(g) at the same temperature. (c) Comment on how the numerical value of an equilibrium constant changes when the balanced equation is written with larger versus smaller stoichiometric coefficients, particularly when Kc>1K_c>1.

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