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On dissolving 0.5 g of non-volatile, non...

On dissolving 0.5 g of non-volatile, non-ionic solute to 39 g of benzene, its vapour pressure decreases from 650 mm of Hg to 640 mm of Hg. The depression of freezing point of benzene (in K) upon addition of the solute is __________.
(Given data: Molar mass & molar freezing point depression is 78 g `mol^(-1) & 5.12 K kg mol^(-1)`]

Text Solution

Verified by Experts

`(650-640)/640=ixx 0.5/Mxx78/39`
`DeltaT_(f)=ixx K_(f)xxm`
`=(650-640)/640xx(Mxx39)/(0.5xx78)xx5.12xx1000/39`
`=10/640xx5.12xx1.025=1.03`
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