The dissociation of hydrogen iodide into its elements takes place in a 1.00dm3 container at 440∘C. When 1.00 mole of hydrogen iodide is used, it is found to have decreased to 0.78 mole at equilibrium.
(1) Calculate the equilibrium constant for this reaction at this temperature.
(2) Deduce whether the dissociation reaction is endothermic or exothermic, given that at 600∘C the value of K is 0.04.