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Boiling point of a solution given density, molecular weight

An environmentally concerned graduate student uses the more earth-friendly anti-freeze, propylene glycol (C3H8O2, density = 1.038). The final composition in her car's radiator is 30% (volume/volume) ethylene glycol (C2H6O2, density 1.114 g/ml)
and 20% (V/V) propylene glycol in water. At what temperature will her engine overheat? (Kb for water =0.52)

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Calculate the molality of the solution:
Remember, for coligative properties the type of solute does not matter. Therefore, the number of moles solute is simply the total number of moles of all coolants. Since the volume of the solution does not matter because we are dealing with
percentages, we will pick 1L.
The volume of propylene glycol is ...

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Boiling point of a solution given density and molecular weight

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