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Question & Answer: A student determines the molar mass of a liquid unknown by the method used in this…..

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 11.1 g of her unknown sample to the mixture, the temperature, after thorough stirring, fell to -3.0°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 °C/m

1. What was the freezing point depression, ΔT ? _________ °C

2. What was the molality, m, of the unknown solution? ________ mol/kg (ΔT = Km)

3. How much unknown liquid was in the decanted solution? __________ g

4. How much water was in the decanted solution? _________ kg

5. What did she find to be the molar mass of the unknown liquid, assuming she made the calculation properly?________ g/mol

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