1. Propane's Formula:

* Propane has the chemical formula C₃H₈. This means each propane molecule has 8 hydrogen atoms.

2. Calculating Total Hydrogen Atoms:

* Since we have 5 propane molecules, we multiply the number of hydrogen atoms per molecule by the number of molecules: 8 H-atoms/molecule * 5 molecules = 40 H-atoms

Answer: There are 40 hydrogen atoms in 5 molecules of propane.