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°C on her thermometer. When she added 12.3 g of her unknown sample to the mixture, the temperature, after thorough stirring, fell to -4.0°C. She then poured off the solution through a screen into a beaker. The mass of the solution was 93.4 g. Kf = 1.86°C/m What was the molality of the unknown solution? ______________ m How much unknown liquid was in the decanted solution? ______________ g How much water was in the decanted solution? ______________ g What did she find to be the molar mass of the unknown liquid, assuming she made the calculation properly?______________ g
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°C on her thermometer. When she added 12.3 g of her unknown sample to the mixture, the
temperature, after thorough stirring, fell to -4.0°C. She then poured off the solution through a
screen into a beaker. The mass of the solution was 93.4 g. Kf = 1.86°C/m
What was the molality of the unknown solution? ______________ m
How much unknown liquid was in the decanted solution? ______________ g
How much water was in the decanted solution? ______________ g
What did she find to be the molar mass of the unknown liquid, assuming she made the
calculation properly?______________ g
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