1. Understand the Formula

Aluminum chloride has the chemical formula AlCl₃. This means each formula unit contains one aluminum ion (Al³⁺) and three chloride ions (Cl⁻).

2. Use the Mole Ratio

* For every 1 mole of AlCl₃, there are 3 moles of Cl⁻ ions.

3. Calculate the Number of Chloride Ions

* Start with the moles of AlCl₃: 1.50 mol AlCl₃

* Multiply by the mole ratio: (1.50 mol AlCl₃) * (3 mol Cl⁻ / 1 mol AlCl₃) = 4.50 mol Cl⁻

4. Convert Moles to Ions

* Use Avogadro's number (6.022 x 10²³ ions/mol) to convert moles of chloride ions to the number of ions:

(4.50 mol Cl⁻) * (6.022 x 10²³ ions/mol) = 2.71 x 10²⁴ chloride ions

Therefore, there are 2.71 x 10²⁴ chloride ions in 1.50 mol of aluminum chloride.