# In the reaction SO_2Cl_2 harr SO_2 + Cl_2, heat is evolved. What happens when chlorine (Cl_2) is added to the equilibrium mixture at constant volume?

reactions will always move to relieve stress. Adding $C {l}_{2}$ to the reaction will cause the reaction to move to the left producing more $S {O}_{2} C {l}_{2}$
Increasing the concentration of $C {l}_{2}$ will increase the concentration of the products on the right side of the equilibrium equation. To decrease the concentration of the products the equilibrium will move to the left producing more reactants.