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The number of moles in 4.5 x 10^24 atoms of oxygen

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

How many moles of al3+ ions are in 1.25 moles of al2o3