Solve for the number of units of SiO2 with a mass of 40.9 g

What would you multiply "atoms of aluminum" by to get the units "grams of aluminum"? (number) (unit) (number) (unit) atoms Al =gAl (number) (unit) (number) (unit)

What would you multiply "atoms of xenon" by to get the units "grams of xenon"? (aumber) (unit) (number) (unit) atoms Xe (number) (unit) (aumber) (unit)

Calculate the number of protons, neutrons, and electrons in: a. Barium with a mass of 136 b. Polonium with a mass of 209 a. Protons Neutrons Electrons b. Protons Neutrons Electrons