[lucky_star]

Problem:
Assuming complete dissociation, calculate the boiling point (in degrees C) of a solution made by dissolving 2.67 g of sodium chloride in 15.7 g of water. The Kfp of the solvent is 0.512 K/m and the normal boiling point is 373K.

Answer: 102.98 Celcius

Attempt:
This problem looks simple, however the trick part is they only gave the Normal boiling point. Please check why I did not get the right answer:

DeltaBP = Kbp*molality

molality= moles of solute/kg of solvent
molality= (2.67/58.44)/(15.7/1000)
molality= 2.91m

Therefore:
DeltaBP = Kbp*2.91

Now, how can I get the Kbp??? Is there any way I can use the Kfp to find Kbp? Someone please help me.

[lucky_star]

Okie, I just found out how to do this problem

[Borek]

The Kfp of the solvent is 0.512 K/m

Looks like Kbp to me, Kfp is something like 1.86 (or close).