106.2g 1 molal aqueous solutio of ethyle...

`106.2g` 1 molal aqueous solutio of ethylene glycol is cooled to `-3.72^(@)C`. Mass of of ice separated during cooling is `(K_(f0` water `=1.86` freezing point of water `=0^(@)C )`

`25g`

`50g`

`60g`

`40g`

Text Solution

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The correct Answer is:

Mass of solute in `1kg` water `=62g`
`:.` Mass of solute in `106.2g` solution `=(62)/(1062)xx106.2=6.2g`
`3.72=1.86xx(6.2xx1000)/(62xxw)`
`w=50" ":.` Mass of ixe separated `=50g`

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