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The equilibrium constant, Kc, for the following reaction is 1.80x10^-2 at 698 K. 2HI(g) ⇌ H2(g) + I2(g) If an equilibrium mixture of the three gases in a 15.3 L container at 698 K contains 0.318 mol of HI(g) and 0.471 mol of H2, the equilibrium concentration of I2 is ____ M.