Fre e points what is 1+1

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?

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block

Why is the melting of ice a physical change ?