It is more convenient to obtain the mole...

It is more convenient to obtain the molecular weight of an unknown solute by measuring the freezing point depression than by measuring the boiling point elevation because

Freezing point depression is a colligative property whereas boiling point elevation is not.

Freezing point depressions are larger than boiling point elevations for the same solution.

Freezing point depressions are smaller than boiling point elevations for the same solution.

Freezing point depression depends more on the amount of the solute than boiling point elevation.

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The freezing point of solution is ……..than the boiling point of pure solvent.

The Rast method, one of the older techniques for finding the molecular mass of an unknown, measures the freezing point depression of solution in camphor. Camphor is used because its freezing point is very sensitive to added solution solute (It has highest K_(f)) . A solution of 2.342 g of an unknown substancein 49.88 g of camphor freezes at 441.2 K . If K_(f) for camphor is 40.0 Kg mol^(-1) , calculate the molecular mass of the unknown. Strategy: Find the molality of the solution from the freezing point of the pure camphor, the freezing point of the solution and the value of K_(f) by using the relationship DeltaT_(f)=K_(f)m . From the molality, find the no. of moles of solute in given mass of solvent. Finally find the molar mass (Melting point of pure camphar is 453.0 K)

Define boiling point. Write the formula to determine molar mass of a solute using freezing point depression method.

During depression of freezing point in a solution, the following are in equilibrium:

The molecular weight of benzoic acid in benzene as determined by depression in the freezing point method corresponds to

When molecular weight of the amines increase their boiling points will

The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to:

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