please help. due at 12 on 2.21. will rate

An equilibrium mixture contains 0.350mol of each of the products (carbon dioxide and hydrogen gas) and 0.200mol of each of the reactants (carbon monoxide and water vapor) in a 1.00L container. CO(g)+H2O(g)CO2(g)+H2(g) How many moles of carbon dioxide would have to be added at constant temperature and volume to increase the amount of carbon monoxide to 0.300 mol once equilibrium has been reestablished? moles of CO2 mol