How many moles of Fe2O3 can be made from 50 moles of Fe?

25 mol.

Explanation:

The balanced chemical equation for the reaction depicted in this question is as follows:

4Fe + 3O2 → 2Fe2O3

Based on the above balanced equation, 4 moles of Fe produced 2 moles of Fe2O3.

Hence, 50 moles of Fe will produce as follows:

50 mol Fe × 2 mol Fe2O3/4 mol Fe

= 100/4

= 25 mol of Fe2O3