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10 Nov 2019
A student determines the molar mass of a liquid unknown by the method used in this experiment. She found that the equilibrium temperature of a mixture of ice and water was 1.0 degree C on her thermometer. When she added 11.1 g of her unknown sample to the mixture, the temperature, after thorough stirring, fell to -3.0 degree C. She then poured off the solution through a screen into a beaker. The mass of the solution was 90.4 g. K = 1.86 degree C/m What was the freezing point depression, Delta T? _____ degree C What was the molality, m, of the unknown solution? ______ mol/kg (Delta T = Km) How much unknown liquid was in the decanted solution? _______ g How much water was in the decanted solution? ______ kg What did she find to be the molar mass of the unknown liquid, assuming she made the calculation properly? _____ g/mol
A student determines the molar mass of a liquid unknown by the method used in this experiment. She found that the equilibrium temperature of a mixture of ice and water was 1.0 degree C on her thermometer. When she added 11.1 g of her unknown sample to the mixture, the temperature, after thorough stirring, fell to -3.0 degree C. She then poured off the solution through a screen into a beaker. The mass of the solution was 90.4 g. K = 1.86 degree C/m What was the freezing point depression, Delta T? _____ degree C What was the molality, m, of the unknown solution? ______ mol/kg (Delta T = Km) How much unknown liquid was in the decanted solution? _______ g How much water was in the decanted solution? ______ kg What did she find to be the molar mass of the unknown liquid, assuming she made the calculation properly? _____ g/mol
Deanna HettingerLv2
16 Jun 2019