If an electric discharge produces 800 cm3 of ozone (O3), how many cm3 of oxygen (O2) are required?

Question

3O2(g) ---> 2O3(g)

Answer 1

When gases are involved one may use stoichiometry as if volume = mols.
800 cc O3 x (3 mols O2/2 mols O3) = 800 x 3/2 = ? cc O2