Typically brass contains 67% (w/w) copper (Cu) and 33% (w/w) zinc (Zn). Find the number of moles of each component (Cu and Zn) contained in a 125 g sample of brass. (Cu = 63.55 g/mol, Zn = 65.38 g/mol)

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

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.

Achemical reaction is done in the setup shown, resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?