PLEASE HELP Will give brainliest and 50 points!! Please give honest answers

Ineed with a, b, c, d, and e on the long answer

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

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?