A sample of propane, C3H8, contains 18.0 moles of carbon atoms. How many total moles of atoms does the sample contain?

1 answer

The same contains 18.0 mols C atoms.
The sample contains 18.0 mols C x 8 mols H/3 mols C) = mols H atoms.
Total mols of atoms = mols C + mols H = ?