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The following reaction was performed in a sealed vessel at 734 °C: H2(g) + I2(g) ⇌ 2HI(g) Initially, only H2 and I2 were present at concentrations of [H2] = 3.65 M and [I2] = 2.10 M. The equilibrium concentration of I2 is 0.0900 M. What is the equilibrium constant, Kc, for the reaction at this temperature? Express your answer numerically.