Problem: What is the molality of NaCI formula units in an aqueous solution if the boiling point of the solution is 102.10 °C at 1 atm. (Water has a boiling point elevation constant of 0.51 °C-kg/mol.)a. 8.2 mb. 4.1 mc. 2.1 md. 0.49 m

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FREE Expert Solution

We’re being asked to determine the molality of NaCl formula units if the boiling point of the aqueous solution is 102.10 ˚C


Recall that the boiling point of a solution is higher than that of the pure solvent and the change in boiling point (ΔT­b) is given by:



The change in boiling point is also related to the molality of the solution:



where: 

i = van’t Hoff factor

m = molality of the solution (in m or mol/kg)

Kb = boiling point elevation constant (in ˚C/m)


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Problem Details

What is the molality of NaCI formula units in an aqueous solution if the boiling point of the solution is 102.10 °C at 1 atm. (Water has a boiling point elevation constant of 0.51 °C-kg/mol.)

a. 8.2 m

b. 4.1 m

c. 2.1 m

d. 0.49 m

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Our tutors have indicated that to solve this problem you will need to apply the Boiling Point Elevation concept. If you need more Boiling Point Elevation practice, you can also practice Boiling Point Elevation practice problems.

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Based on our data, we think this problem is relevant for Professor Norton's class at UGA.