Another way that freezing point depression can be useful is to experimentally de

Question

Another way that freezing point depression can be useful is to experimentally determine the molar mass of an unknown solute in a solution. Use the data in the table to answer the questions below and identify the unknown solute.

Mass of solvent 10.208 g Freezing point of pure solvent 26.7 Another way that freezing point depression can be useful is to experimentally determine the molar mass of an unknown solute in a solution. Use the data in the table to answer the questions below and identify the unknown solute. What mass of solute was used? What is the freezing point depression ?Tf of the solution? What is the colligative molality mc of the solution? Assuming a van 't Hoff factor i = 1, how many moles of solute are present in solution? What is the molar mass of the solute?

Explanation / Answer

What mass of solute was used? = Mass of solution 10.930 g - Mass of solvent 10.208 g

= 0.722g

What is the freezing point depression, Tf, of the solution?

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