What is the freezing point depression constant of cyclohexane?
20.2 °C-kg per mol
The freezing point depression constant of cyclohexane is 20.2 °C-kg per mol of solute. The density and volume of cyclohexane are used to calculate the mass of the solvent. The values of the freezing point of the pure solvent and the freezing point of the solution are determined from the plots.
What is the molar mass of cyclohexane?
84.16 g/molCyclohexane / Molar mass
Which is the better solvent for molar mass determinations by freezing point depression benzene or cyclohexane explain?
cyclohexane
cyclohexane is the better solvent for freezing point depression determinations of molar mass; because a less concentrated solution will still give a substantial freezing-point depression.
What is the freezing point of cyclohexane?
Exercise: The freezing point of cyclohexane is 6.50 °C. A solution is prepared by dissolving 0.5580g of an unknown solute in 33.50 g cyclohexane. The freezing point of the solution is 4.32 °C.
How do you find the mass of a cyclohexane solution?
- Mass of cyclohexane in solution (kg) = Mass of cyclohexane (g) /1000.
- Moles of solute, total (mol) = molality (mol/kg) * Mass of Cyclohexane (kg)
- Mass of solute in solution, total (g)
- Molar mass of solute (g/mol) = mass of the solute in solution / moles of the solute.
- Average molar mass of solute (g/mol)
- Σx−μ| |
What is depression in freezing point How is molecular weight of a dissolved substance determined with this method?
Answer. Answer: Freezing point depression is a colligative property observed in solutions that results from the introduction of solute molecules to a solvent. The freezing points of solutions are all lower than that of the pure solvent and is directly proportional to the molality of the solute.
How do you find molar mass from Molality?
Step 1: List the known quantities and plan the problem. Use the freeing point depression (ΔTf) to calculate the molality of the solution. Then use the molality equation to calculate the moles of solute. Then divide the grams of solute by the moles to determine the molar mass.
How do you find molar mass from molality?