The following reaction was performed in a sealed vessel at 728 °C: H₂(g)+I₂(g)⇌2HI(g). Initially, only H₂ and I₂ were present at concentrations of [H₂​]=4.00M and [I₂]=2.40M. The equilibrium concentration of I2 is 0.0400M. What is the equilibrium constant, Kc, for the reaction at this temperature?