The formula for iron oxide (rust) is Fe₂O₃, not 2Fe03.

Here's how to figure out the number of atoms in a molecule of Fe₂O₃:

* Fe₂ means there are 2 iron (Fe) atoms.

* O₃ means there are 3 oxygen (O) atoms.

Therefore, there are a total of 2 + 3 = 5 atoms in a molecule of iron oxide (Fe₂O₃).