1. Find the molar mass of CaCl₂:
* Ca (Calcium) has a molar mass of 40.08 g/mol
* Cl (Chlorine) has a molar mass of 35.45 g/mol
* Since there are two chlorine atoms in CaCl₂, the total molar mass is: 40.08 g/mol + (2 * 35.45 g/mol) = 110.98 g/mol
2. Use the formula:
* moles = mass / molar mass
3. Plug in the values:
* moles = 25 g / 110.98 g/mol
* moles ≈ 0.225 mol
Therefore, there are approximately 0.225 moles in a 25 g sample of CaCl₂.
