The reaction between sulfur dioxide and oxygen is exothermic. 2 SO2 (g) + O2 (g) <---> 2 SO3 (g) Which of the following factors will cause the equilibrium to be shifted to the right ( in favor of products ) ? a. SO3 (g) is added b. O2 (g) is removed c. The temperature is increased ( heat added ) d. SO3 (g) is removed