The interactions of Matter

Question

What is the molality of a solution made up of 4.84 kg of  dissolved by 13.5 kg of water? Show your work.

Answer 1

molality is moles of solute divided by kg of solvent.

atomic mass of Ca: 40.078 g/mol

atomic mass of Cl: 35.453 g/mol

molecular mass of CaCl₂ = 40.078 + 2*35.453

=110.98 g/mol

4.84 kg CaCl₂ *1 mol CaCl₂ / 110.98 g CaCl₂ * 1000 g/1kg = 43.61 mol CaCl₂

molality of CaCl₂ solution = 43.61/13.5 = 3.23 mol/kg