This is a pretty strightforward problem.
Since you have your balanced chemical reaction you have your molar ratio.
That is what is always going to get you from one amount of a certain substance to the amount of the other.
therefore, since it is a molar ratio, you need to find the amount in moles of a given substance thati s reacting.
Lucky for you, you knwo already that 3 moles of water are reacting.
using the molar ratio provided by the reaction, you can get both the amount in moles of CO2 and O2. Using your molar mass of CO2 you can get grams.
How ever for the volume of O2 gas I am pretty sure oyu need more information... like a concentration or a pressure. For instance, a greater volume of O2 will be produced in the same reaction at a higher temperature.