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4. At what temperature will a solution of 8.27 g CaCl2 in 45.0 g H2O begin to freeze? Assume
complete dissociation
of CaCl2. (The freezing point depression constant for water is
Solution
molality = (8.27/111)*(1000/45) = 1.655
vant hoff factor = 3
so deltaT= K*M*i = 1.86 * 1.655 *3 = 9.24
so Tsolvent - Tsolution = deltaT........ => Tsolution = Tsolvent - deltaT.... =>Tsolution = 1-9.24
= 8.24'C

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  • 1. 4. At what temperature will a solution of 8.27 g CaCl2 in 45.0 g H2O begin to freeze? Assume complete dissociation of CaCl2. (The freezing point depression constant for water is Solution molality = (8.27/111)*(1000/45) = 1.655 vant hoff factor = 3 so deltaT= K*M*i = 1.86 * 1.655 *3 = 9.24 so Tsolvent - Tsolution = deltaT........ => Tsolution = Tsolvent - deltaT.... =>Tsolution = 1-9.24 = 8.24'C