Sulfur dioxide and oxygen react to form sulfur trioxide, like this: 2 SO2(9)+O2(g) 2 SO3(9) The reaction is exothermic. Suppose a mixture of SO 2, O2 and Soz has come to equilibrium in a closed reaction vessel. Predict what change, if any, the perturbations in the table below will cause in the composition of the mixture in the vessel. Also decide whether the equilibrium shifts to the right or left. perturbation change in composition shift in equilibrium O to the right The temperature is raised. The pressure of SO3 will to the left ? O (none) to the right to the left The temperature is lowered. The pressure of O2 will ? O (none)