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Sublimation

Calculate the...

Question

Calculate the molal depression constant of a solvent which has freezing point ${16.6}^{o} C$ and latent heat of fusion $180.75 J g^{- 1}$

2.68

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3.86

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4.68

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2.86

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Solution

The correct option is B 3.86
$K_{f} = \frac{R T_{0}^{2}}{1000 L} T_{0} = 273 + 16.6 = 289.6 K$
$= \frac{8.314 \times (289.6)^{2}}{1000 \times 180.75} = 3.86$

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