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Pure water freezes at 273 K and 1 bar. T...

Pure water freezes at 273 K and 1 bar. The addition of 34.5 g of ethanol to 500 g of water changes the freezing point of the solution. Use the freezing point depression constant of water as `"2 K kg mol"^(-1)`. The figures shown below represent plots of vapour pressure (V.P.) versus temperature (T). [molecular weight of ethanol is 46 g `mol^(-1)`]
Among the following, the option representing change in the freezing point is

A

B

C

D

Text Solution

Verified by Experts

Mole of `C_(2)H_(5)OH=34.5/46`
`m=34.5/46xx1000/500`

`DeltaT_(f)=34.5/46xx1000/500xx2=3`
`T_(f)^(@)-T_(f)=273-T_(f)=3`
`T_(f)=273-3=270K`
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