1.

How many grams of methyl alcohol should be added to I 0 litre tank of water to prevent its freezing at 268 K ? (K _(f) for water is 1.86 K k g mol ^(-1))

Answer»

`880.07g`
`899.04g`
`886.02g`
`868.06g`

Solution :`DELTA T _(f ) = K _(f ) m`
where m = molality
`273 -268 =1.86 xx(W)/( M X v)`
` 5=1 .86 xx(w)/( 32xx10)`
`w= ( 5xx32xx10)/(1.86)`
`= 560.2 ~~ 868 .06g`


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