8 Fe (s) + S8 (s) --> 8 FeS (s)

Question

If 3.00 g of iron reacts completely 4.72 g of FeS is produced.

If 7.50 g of sulfur reacts completely 20.56 g of FeS is produced.

 

Which reactant will be left over if 3.00 g of iron reacts with 7.50 g of sulfur?

Answer 1

From the numbers, only 4.72 g of FeS can be produced before the Fe runs out, leaving much excess S.