1. Find the molar mass of sulfur:
* The molar mass of sulfur (S) is approximately 32.06 g/mol.
2. Calculate the number of moles of sulfur:
* Divide the given mass by the molar mass:
* Moles of S = 128.4 g / 32.06 g/mol = 4 mol
3. Use Avogadro's number to find the number of atoms:
* Avogadro's number is 6.022 x 10²³ atoms/mol.
* Multiply the number of moles by Avogadro's number:
* Atoms of S = 4 mol * 6.022 x 10²³ atoms/mol = 2.409 x 10²⁴ atoms
Therefore, there are approximately 2.409 x 10²⁴ atoms in 128.4 grams of sulfur.
