At high temperatures, sulfur combines with iron to form the brown-black iron (II) sulfide:

Question

Fe (s) + S (l)--> FeS (s)
How do you calculate the mass of FeS formed?
Thank you!

Answer 1

Here is a worked example of a stoichiometry problem. You will have many of these in a chemistry course. Bookmark this page so you can refer to it as needed. Most stoichiometry problems are alike.
http://www.jiskha.com/science/chemistry/stoichiometry.html