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Water of Crystallization

The cryoscopi...

Question

The cryoscopic constant value depends upon?

the molar mass of the solute in the solution

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the molar mass of the solvent in the solution

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the enthalpy of vaporization of the solvent

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the freezing point of the solvent

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Solution

The correct option is A the molar mass of the solute in the solution
Cryoscopic constant may be defined as the depression in freezing point when one mole of non-volatile solute is dissolved in one kg of solvent. It may also be defined as the molal depreesion constant . Its unit is k.kg.mol $^{- 1}$ . It depends on the malar mass of the solute in the solution.

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K_{f} is cryoscopic constant

T_{f} is F.P. of pure solvent

M is the molar mass of solvent

Δ H_{f u s} is the molar enthalpy of fusion of the solvent

1.0 \times 10^{- 3}

0.0985

0.211

1.6 \times 10^{- 3}

0.086

0.34

= 60

1 g

= 50 g

{m o l}^{- 1}

50 g

1 K

127^{\circ} C

8000 c a l m o l^{- 1}

80 g / m o l

R (ideal gas constant) \approx 2 c a l m o l^{- 1} K^{- 1}

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