A solution of glucose in water has boiling point equals 100. 20 degree Celsius . Calculate the freezing point of the same solution . Molal constant for water Kf and KB are 1.86 kelvin kg per mole and 0.512 kelvin kg per mole respectively. My question is why we are taking temperature in Celsius while the units of molar constant Kf and Kb are given in kelvin. please don't send any link and copy the answer.

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you can take the temperature into K but the answer will be same for both because of difference in temperature either in K or in degree centigrade will be same. The correct way is to convert this temperature into K.

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