When the ideal gas law is arranged as shown below, what property of the gas is being solved for (represented by the x)? x equals nrt over v moles pressure temperature volume

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?