Calculate the mass percent of calcium chloride in 8.87 g of calcium chloride in 65.1 g of water

11.99 % ≅ 12.0%.

Explanation:

∵ mass % = [mass of solute/mass of solution] x 100.

mass of solute (CaCl₂) = 8.87 g & mass of solution = 8.87 g + 65.1 g = 73.97 g.

∴ mass % of (CaCl₂) = [mass of solute/mass of solution] x 100 = (8.87 g / 73.97 g) x 100 = 11.99 % ≅ 12.0%.