How many iron atoms are in 0.850 moles of iron

Which one of the following gases is not an important component of soil?

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 oxygen gas are produced from the decomposition of six moles of potassium