Boiling points and molality Similar to the freezing-point depression, the boilin

Question

Boiling points and molality Similar to the freezing-point depression, the boiling-point elevation Delta Tb of a solution is quantitatively related to the molality m and the boiling-point-elevation constant Kb of the solvent by the equation Delta Tb = Kb m where the boiling-point elevation is the difference between the boiling points of the solution and the pure solvent. A solution of water (Kb = 0.512 degree C/m) and glucose boils at 101.56 degree C. What is the molal concentration of glucose in this solution? Assume that the boiling point of pure water is 100.00 degree C. Express the molal concentration numerically.

Explanation / Answer

delta T = Kb x m => 1.56 = 0.512 x m => molality = 3.047 m

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