Question

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]=3.30M and[I2]=3.00M. The equilibrium concentration of I₂ is 0.0600 M . What is the equilibrium constant, Kc, for the reaction at this temperature?

Express your answer numerically.