find the mass of 3.49 moles of gold. use the formula( n=M/m; where m id mass, n is mlles and M is molar mass).

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.

Ais a mountain created from eruptions of lava, ash, rocks, and hot gases.

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.