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How many grams of methyl alcohol should ...

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))`

A

`880.07g`

B

`899.04g`

C

`886.02g`

D

`868.06g`

Text Solution

Verified by Experts

The correct Answer is:
D
`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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