1. Determine the number of atoms per formula unit:
* Na₂SO₄ has 2 sodium (Na) atoms, 1 sulfur (S) atom, and 4 oxygen (O) atoms.
* Total atoms per formula unit: 2 + 1 + 4 = 7 atoms
2. Use Avogadro's number:
* Avogadro's number states that 1 mole of any substance contains 6.022 x 10²³ particles (atoms, molecules, etc.).
3. Calculate the number of atoms:
* Step 1: Multiply the moles of Na₂SO₄ by Avogadro's number to find the number of formula units: 3.2 moles * (6.022 x 10²³ formula units/mole) = 1.927 x 10²⁴ formula units
* Step 2: Multiply the number of formula units by the number of atoms per formula unit: 1.927 x 10²⁴ formula units * 7 atoms/formula unit = 1.349 x 10²⁵ atoms
Therefore, there are approximately 1.349 x 10²⁵ atoms in 3.2 moles of Na₂SO₄.
