What is the volume occupied by 3.5 mol CO2 gas?

Rutherford's experiment indicated that matter was not as uniform as it appears what part of his experimental results implied this idea

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?