Which of the following has the lowest freezingpoint? Assume that all the species are mixedas shown and are completely dissociated.
1.2.0msodium perchlorate2.1.5mlithium sulfate3.1.0mpotassium phosphate4.1.5maluminum nitratecorrect5.1.0mmagnesium phosphateExplanation:The aluminum nitrate has an ideal van’tHoff factor (i) of 4 which will scale the statedmolality (1.5) up to a 6.0 for the effective
rose (kmr2427) – Homework 2 – fakhreddine – (51615)11molality. This effective molality is the highestin the group and therefore will have the lowestfp, the highest bp, and the maximum osmoticpressure.
0311.0pointsA semi-permeable membrane can withstandan osmotic pressure of 0.75 atm.What mo-larity of aqueous magnesium bromide solutionwould reach the limit for this membrane? (as-sumeRT= 25 L·atm·mol−1).
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- Fall '07
- Holcombe
- Mole, Vapor pressure, Molecule, mol, Amount of substance
