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Problem 14 - Entrance Test

The equilibrium constant for the reaction of H2 and I2 to form HI is given by Kc = [HI]^2 / [H2] [I2]. If the initial concentrations are [H2] = [I2] = 1 M and the equilibrium concentrations are [HI] = 0.5 M, [H2] = [I2] = 0.5 M, find the value of Kc.

Correct: B

Using the given equation, Kc = [HI]^2 / [H2] [I2]. Given [HI] = 0.5 M, [H2] = [I2] = 0.5 M. So, Kc = (0.5)^2 / (0.5 * 0.5) = 0.5.