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0.2m aqueous solution of KCI freezes at – 0.68°C calculate van’t Hoff factor. Kf for water is 1.86 K kg mol-1.

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i = (Observed property) / (Throretical property (calculated))

Given, 

∆T = 0.680 K 

m = 0.2 m,

∆Tf (observed) = 0.680K 

∆Tf (Calculated) = kf 

m = (1.86 K kg mol-1) x (0.2 mol kg-1) = 0.372K

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