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Q.

A solution containing 62 g ethylene glycol in 250 g water is cooled to $- 10^{0} C .$ If $K_{f}$ For water is 1.86 $K K g m o l e^{- 1},$ The amount of water (in g) separated as Ice is ____g

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answer is 64.

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Detailed Solution

$Δ T_{f} = K_{f} m$

$10 = 1.86 \times \frac{62}{62} \times \frac{1000}{W}$

$∴ W = 186 g \Rightarrow m a s s o f t h e = 250 - 186 = 64 g$

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