Here's a breakdown:

* Molecular Formula: Both propanol and isopropanol have the molecular formula C3H8O. This means they contain the same number of carbon, hydrogen, and oxygen atoms.

* Structural Formula: The arrangement of these atoms differs. Propanol has a linear structure with the hydroxyl group (OH) at the end of the carbon chain. Isopropanol has a branched structure with the hydroxyl group attached to the middle carbon atom.

Here's a simple analogy: Imagine you have a set of LEGO blocks. You can build different structures (isomers) using the same number of blocks (atoms) but arranging them differently.

Let me know if you would like a visual representation of their structures!