Pure water freezes at 273   K and 1   bar pressure. The addition of 34 . 5   g of ethanol to…

Pure water freezes at 273 K and 1 bar pressure. 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 the plots of vapour pressure (V.P.) versus temperature (T). [Molecular weight of ethanol is 46 g 46 g mol-1]
Among the following, the option representing a change in the freezing point is

Solution

Ethanol should be considered yo be a non-volatile solute as per the given options.

ΔTf=Kf×m,

ΔTf=2×34.546×0.5=3 K,

Tf0=273 K,

Tf=270 K.

 

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Asked in: JEE Advanced 2017 (Paper 2)

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