If I have 8 moles of Iron atoms in the products, how many moles of iron atoms did I start with?

8**
16
1
Not enough information

is this correct, and if not, can you explain why

This answer is correct.

The Law of Conservation of Mass states that the total mass of the reactants must be equal to the total mass of the products in a chemical reaction. Therefore, if there are 8 moles of iron atoms in the products, this means that there must have been 8 moles of iron atoms in the reactants as well.