Question

Using the Law of Conservation of Matter, determine the number of grams of iron sulfide (FeS) that will be produced in this reaction 112g Fe + 64g S → _____ g FeS. A. 48 grams B. 64 grams C. 112 grams D. 176 grams

Answer 1

The Law of Conservation of Mass states that the mass of reactants entering a reaction must be equal to the mass of the products exiting it. In this case, we only have 2 reactants, Fe and S, and we only have 1 product, FeS. Therefore we expect the total mass of the Fe and S reactants to equal the mass of FeS. This gives us 112 g + 64 g = 176 g of FeS, which is choice D.

Answer 2

In the Law of Conservation of Matter, the mass in should be equal to the mass out. So, for the reaction, 

112g Fe + 64g S →_____ g FeS

Mass in is equal to 112 g plus 64 g which is 176 g. Therefore, the correct answer among the choices is option D.