Question

Calculate the molar mass of CaCl2

Element Number of moles Atomic Mass Total Mass
Ca 1 40.1 g/mole 40.1 g
Cl 2 35.5 g/mole 71.0 g
CaCl2 Find the moles. Find it. 111.1 g

Answer 1

Molar mass of CaCl2:

- Ca: 1 × 40.078 g/mol = 40.078 g/mol
- Cl: 2 × 35.453 g/mol = 70.906 g/mol

Total = 40.078 + 70.906 = 110.984 g/mol ≈ 111.0 g/mol

Moles: 1 mol of Ca and 2 mol of Cl per 1 mol of CaCl2, so 1 mol CaCl2 has a mass ≈ 111.0 g (molar mass = 110.98 g/mol).