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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 ch

Correct answer

3

Step-by-step solution

Ethanol should be considered yo be a non-volatile solute as per the given options. ΔT f = K f × m , ΔT f = 2 × 34 .5 46 × 0 .5 = 3 K , T f 0 = 273 K , T f = 270 K .

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