What is the molality of a solution made by combining 5.0 g of CaCl2 with 500.0 g of water?

Molality is defined as the number of moles of solute dissolved in 1 kg of solvent.

To calculate molality, we need to calculate the number of moles of CaCl₂.

Mass of CaCl₂ - 5.0 g

Molar mass of CaCl₂ - 111 g/mol

The number of moles of CaCl₂ - 5.0 g / 111 g/mol = 0.045 mol

we need to then calculate the number of moles in 1 kg solvent.

number of CaCl₂ moles in 500 g water - 0.045 mol

Therefore number of moles in 1 kg water - 0.045 mol / 500g x 1000 g = 0.090 mol

Molality of CaCl₂ - 0.090 mol/kg