What is 5 divided by 2.7

List four observations that indicate that a chemical reaction may be taking place

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