The equilibrium constant for the following gas phase reaction is 0.50 at 600°C. A mixture of HCHO, H2, and CO is introduced into a flask at 600°C. After a short time, analysis of a small amount of the reaction mixture shows the concentrations to be [HCHO] = 1.5 M, [H2] = 0.5 M, and [CO] = 1.0 M. Which of the following statements about this reaction mixture is true? HCHO H2 + CO A) The reaction mixture is at equilibrium B) The reaction mixture is not at equilibrium, but no further reaction will occur. C) The reaction mixture is not at equilibrium, but will move toward equilibrium by forming more HCHO D) The reaction mixture is not at equilibrium, but will move toward equilibrium by using up more HCHO.