At 700 K the following reaction is at equilibrium: H _2(g)+ I _2(g) 2 , HI (g)

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

Problem

At 700 K the following reaction is at equilibrium: H2(g)+I2(g)⇌2 HI(g).\text{H}_2(g)+\text{I}_2(g)\rightleftharpoons 2\,\text{HI}(g). The equilibrium concentrations are [H2]=0.15 M[\text{H}_2]=0.15\,\text{M}, [I2]=0.15 M[\text{I}_2]=0.15\,\text{M}, and [HI]=0.70 M[\text{HI}]=0.70\,\text{M}. What is the numerical value of KcK_c at this temperature? (a) 3131 (b) 0.0460.046 (c) 2222 (d) 1111

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