Question

According to Le Chatelier's principle, does the equilibrium shift to the products or reactants when O2 is added to the equilibrium mixture of the following:
A. 302(g) - 2O3(g)

Answer 1

The reaction tries to undo what we've done; i.e., we add O2 so the reaction uses the extra O2 and the only way it can do that is to shift to the right toward the products.