An increase in temperature will affect the equilibrium of the reaction 2SO2 g + O2 g 2SO3 g according to Le Chatelier's Principle. This principle states that if a system at equilibrium is subjected to a change in temperature, pressure, or concentration of reactants and products, the system will adjust its equilibrium position to counteract the change.In this case, the reaction is exothermic, meaning it releases heat when it proceeds in the forward direction 2SO2 + O2 2SO3 . When the temperature is increased, the system will try to counteract the change by shifting the equilibrium position to consume the excess heat. This means the reaction will shift towards the endothermic reverse direction, where heat is absorbed 2SO3 2SO2 + O2 .As a result, an increase in temperature will cause the equilibrium to shift towards the reactants, decreasing the concentration of SO3 and increasing the concentrations of SO2 and O2.