Here's how to figure out the number of atoms in propane:

* The Formula: Propane's chemical formula is C₃H₈.

* Subscripts: The subscripts tell us how many of each type of atom are present in a single molecule.

* Calculation:

* There are 3 carbon atoms (C₃).

* There are 8 hydrogen atoms (H₈).

Total: Propane has 11 atoms (3 carbon + 8 hydrogen).