Why are you instructed to feel the outside of a test tube after 2 chemicals are mixed

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?

Find the missing probability in the table below a.0.10 b.40 c.0.80 d. 0.20

Explain what happened when the storm surges from hurricanes reached the gulf coast