Question

The freezing point of pure water was determined by plotting the temperature as a function of time. The freezing point was determined to be 0.021 °C. A sample of an unknown liquid having a volume of 39.0 mL was then thoroughly mixed with 225 mL of deionized water. The liquid had a density of 0.790 g/mL. The resulting freezing point of the unknown in water was determined to be -4.25 °C. Kf for water is 1.86 °C/m. 1. Calculate ΔTf for water in this experiment. 2. What is the molality of the solution of the unknown in water? 3. How many moles of the unknown liquid are there in the solution? 4. What is the molar mass of the unknown liquid? (Hint: you will need to convert 39 mL to grams)

          The freezing point of pure water was determined by plotting the temperature as a function of time. The freezing point was determined to be 0.021 °C. A sample of an unknown liquid having a volume of 39.0 mL was then thoroughly mixed with 225 mL of deionized water. The liquid had a density of 0.790 g/mL. The resulting freezing point of the unknown in water was determined to be -4.25 °C. Kf for water is 1.86 °C/m.

1. Calculate ΔTf for water in this experiment.
2. What is the molality of the solution of the unknown in water?
3. How many moles of the unknown liquid are there in the solution?
4. What is the molar mass of the unknown liquid? (Hint: you will need to convert 39 mL to grams)

Added by Andrew R.

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