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How much ethyl alcohol should be added t...

How much ethyl alcohol should be added to 1L of water so that the solution will not freeze at `-10^@C. (K_(f)" of water "=1.86" K kg mol"^(-1))`.

Text Solution

Verified by Experts

Using the relation, `Delta T_(f)= K_(f).m`
`Delta T_(f)= 10^(@)C`
Molality, `m= (DeltaT_(f))/(K_(f))= (10)/(1.6)= 6.25`
Quantity of ethyl alcohol to be added `= mxx` molecular weight
`=6.25 xx 46.0= 287.5g`
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