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Molal elevation constant of water

The boiling point of 0.1 molal aqueous solution of urea is 100.18oC  at 1 atm. The molal elevation constant of water is: (a) 1.8    (b) 0.18   (c) 18    (d) 18.6

Answer: (a) Kb = 0.18/0.1 = 1.8

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