At 700 K, the reaction 2SO2(g) + O2(g) <--> 2SO3(g) has the equilibrium constant Kc = 4.3 × 106, and the following concentrations are present: [SO2] = 0.10 M; [SO3] = 10. M; [O2] = 0.10 M. Is the mixture at equilibrium? If not at equilibrium, in which direction (as the equation is written), left to right or right to left, will the reaction proceed to reach equilibrium? Yes, the mixture is at equilibrium. No, the reaction will shift to the right (forward towards the products) No, the reaction will shift to the left (reverse towards the reactants)