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# Boiling point of a solution given density, molecular weight

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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).

https://brainmass.com/chemistry/energetics-and-thermodynamics/boiling-point-solution-density-molecular-weight-89180

#### Solution Preview

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 ...

#### Solution Summary

Boiling point of a solution given density and molecular weight is determined in the solution.

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## Properties of Solutions: Colligative Properties

Properties of Solutions

1. Anthraquinone contains only carbon, hydrogen and oxygen and has an empirical formula of C7H4O. The freezing point of camphor is lowered by 22.3oC when 1.32 g of antraquinone is dissolved in 11.4 g of camphor. Determine the molecular formula of anthraquinone. ( Kf for camphor is 40.0).

2. A solution is prepared by mixing 25 ml of C5H12 ( density = 0.63 g/ml) and 45 ml of C6H14 ( density = 0.66 g/ml). Assume that the volumes add on mixing, calculate for C5H12
a) mass %
b) mole fraction
c) molality
d) molaroty.

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