1. Find the molar mass of CaCl₂:

* Calcium (Ca): 40.08 g/mol

* Chlorine (Cl): 35.45 g/mol (and we have two chlorine atoms)

* Molar mass of CaCl₂ = 40.08 g/mol + (35.45 g/mol * 2) = 110.98 g/mol

2. Use the formula:

* Moles = mass (g) / molar mass (g/mol)

3. Plug in the values:

* Moles = 7.5 g / 110.98 g/mol

* Moles ≈ 0.0675 mol

Therefore, 7.5 grams of CaCl₂ is approximately equal to 0.0675 moles.