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:
i = van’t Hoff factor
m = molality of the solution (in m or mol/kg)
Kb = boiling point elevation constant (in ˚C/m)
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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