To determine the number of atoms in Fe2O3 (iron(III) oxide), we need to consider the subscripts in the chemical formula. The subscript "2" after Fe indicates that there are two atoms of iron, and the subscript "3" after O indicates that there are three atoms of oxygen in one molecule of Fe2O3.
Therefore, in one molecule of Fe2O3, there are:
- 2 atoms of iron (Fe)
- 3 atoms of oxygen (O)
Adding them together, we have a total of 2 + 3 = 5 atoms in Fe2O3.