Question

How many atoms does Iron oxide have?

Answer 1

Added together = 159.7 grams for one mole of Fe2O3. That is moles of hematite, but the question is about iron. We can see there are two iron atoms for every hematite molecule. So the number (moles) of iron atoms is twice the moles of the hematite molecules. 

so depending on how much you initially have will determine the answer