The following reaction was performed in a sealed vessel at 764 C: H2(g) +12(g) = 2HI(g) Initially, only H2 and 12 were present at concentrations of [H2] = 3.40 M and [12] = 2.10M. The equilibrium concentration of I2 is 0.0500 M. What is the equilibrium constant, Kc, for the reaction at this temperature