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  4. 2 moles of non-volatile solute is added to 1 kg water at -8° C . Kf of water is 2 K textkg mol- 1. Mass of ice that separates out is (Ignoring the effect of change in volume)

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Q. $2$ moles of non-volatile solute is added to $1$ $kg$ water at $-8^\circ C$ . $K_{f}$ of water is $2$ $K \, \text{kg}$ $mol^{- 1}.$ Mass of ice that separates out is (Ignoring the effect of change in volume)

NTA AbhyasNTA Abhyas 2020Some Basic Concepts of Chemistry

Solution:

For no freezing to take place at $-8^\circ C$ , $4 \, moles$ solute should be added to $1 \, kg$ water but, since $2 \, mole$ solute only is available it can stop the freezing of $500$ $g$ water only. $500 \, g$ ice is formed.