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 constant Kb of the solvent by the equation of a solution is quantitatively related to the molality m and the boiling point elevation where the boiling-point elevation is the difference between the boiling points of the solution and the pure solvent. Part C A solution of water (Kb 0.512 °C/m) and glucose boils at 103.06 °C. What is the molal concentration of glucose in this solution? Assume that the boiling point of pure water is 100.00° C. Wth modal coenratio f e Express your answer to three significant figures and include the appropriate units. m3.53 m m = Submit Hints My AnswersGive Up Review Part

Explanation / Answer

we know that

elevation in boiling point is given by

dTb = i x Kb x m

her m is the molality

given glucose solution

we know that

glucose is non electrolyte solution

so

i = 1

now

we get

dTb = Kb x m

now

dTb = boiling point of solution - normal boiling point of water

given

boiling point of solution = 103.06

and

normal boiling point of water = 100 C

so

dTb = 103.06 - 100

dTb = 3.06

now

dTb = Kb x m

given

Kb = 0.512

so

we get

3.06 = 0.512 x m

m = 5.976

so

the molal concentration of glucose is 5.976 m

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