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How have the greenhouse gasses increased from the year 2000 to 2018

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?