A solution of NaCl in water has a concentration of 26.7%. Calculate the molality of the solution?

Question

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Answer 1

Assume you have 100 g of solution, of which 26.7 grams will be NaCl and the remaining 73.3 grams will be water.

Molality is moles solute/kg solvent, so convert the NaCl to moles and the water to kg.

moles NaCl = 26.7 g / 58.5 g/mole = 0.456 moles
mass water = 73.3 g/ 1000 g/kg = 0.0733 kg
molality = 0.456/0.0733 = 6.22 m