A sample of propane, C3H8, contains 14.0 moles of carbon atoms. How many total moles of atoms does the sample contain?

Answer 1

1 mole C3H8 contains 3 mol C and 8 mol H, 14 mol C will:

14 mol C x 1 mol C₃H₈/ 3 mol C x 8 mol H / 1 mol C₃H₈ = 37.3 mol H

The total moles in the sample: 14 mol C + 37.3 mol H = 51.3 mol atoms