Which way will the reaction below proceed if more oxygen is

Which way will the reaction below proceed if more oxygen is added to the system? to the right to the left neither direction

Solution

In this reaction SO2 and O2 are the product and SO3 is the reactant.
Ke = [products] / [reactant]

so when oxygen added then [products] increases but to keep Keq constant backward reaction occurs that means concentration of SO3 increases.

Hence to the left is the answer.