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A closed system initially containing 1.000 x 10-3 M H2 and 2.000 x 10-3 M I2 at 448 °C is allowed to reach equilibrium. Analysis of the equilibrium mixture shows that the concentration of HI is 1.87 x 10-3 M. Calculate Kc at 448 °C for the reaction taking place given below. H2 (g) + I2 (g) 2 HI(g)