I need helpp!! This is due tomorrow at 8 am it says to Calculate the density of a solid that has a mass of 32.5 g and displaces 6.7 mL of water.

What is the maximum amount of al2(so4)3 which could be formed from 15.84 g of al and 12.89 g of cuso4?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

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?