Question: how many atoms are in a molecule of c3h8o?
Answer: moles of C3H8O = 72.5 g / 60.095 g/mol = 1.21 mol 1 mol of H atoms is 6.022 x 1023 H atoms 5.82 x 1024 H atoms 3.3 1 mol C3H8O molecules contains 8 mol H atoms 72.5 g C3H8O 1 mol C3H8O 60 g C3H8O x 8 mol H atoms 1 mol C3H8O x 6.022 x 1023 H atoms 1 mol H atoms x = Steps: 1.