1. Find the molar mass of iodine (I):
* The molar mass of iodine is 126.90 g/mol (you can find this on the periodic table).
2. Calculate the number of moles of iodine:
* Moles = mass / molar mass
* Moles = 85.979 g / 126.90 g/mol
* Moles ≈ 0.677 mol
3. Use Avogadro's number to find the number of atoms:
* Avogadro's number is 6.022 x 10^23 atoms/mol
* Number of atoms = moles x Avogadro's number
* Number of atoms ≈ 0.677 mol x 6.022 x 10^23 atoms/mol
* Number of atoms ≈ 4.08 x 10^23 atoms
Therefore, there are approximately 4.08 x 10^23 atoms in a sample of 85.979 g iodine.
