That is still incorrect.

By looking at the formula,

In 1 mole of propane, there are

  • 3 moles of carbon atoms and
  • 8 moles of hydrogen atoms

So, in 2 moles of propane, there will be

  • 3 x 2 = 6 moles of carbon atoms and
  • 8 x 2 = 16 moles of hydrogen atoms