To determine the number of atoms in a given amount of a substance, you need to use Avogadro's number, which states that one mole of any substance contains approximately 6.022 × 10^23 particles (atoms, molecules, or ions).
Propane (C3H8) has a molar mass of approximately 44.1 grams/mole. We can use this information to calculate the number of moles of propane in 36 grams.
Number of moles = Mass / Molar mass = 36 grams / 44.1 grams/mole ≈ 0.816 moles
Since one mole of propane contains 6.022 × 10^23 molecules, we can multiply the number of moles by Avogadro's number to find the number of molecules or atoms.
Number of atoms = Number of moles × Avogadro's number ≈ 0.816 moles × 6.022 × 10^23 atoms/mole ≈ 4.917 × 10^23 atoms
Therefore, approximately 4.917 × 10^23 atoms are present in 36 grams of propane.