Question

How many atoms of iron will react with an excess of sulfur to form 3.098 grams of iron (II) product? Fe + S ---> FeS (2.12x10*25)

I would appreciate if an explanation would be given... I need more than just the answer. Thank you!

Answer 1

Here is a worked example of a stoichiometry problem. After you have found the moles of Fe, remember that 1 mole of anything will contain, in the case of Fe, 6.02E23 atoms.
http://www.jiskha.com/science/chemistry/stoichiometry.html