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Part of molten rock at mid-ocean ridges

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

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