Please solve this question Super duper urgent.​

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

Connect the whole numbers on the periodic table to indicate what they represent?

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car