You remember Dr. Laude saying

Question

something about how adding salt to water
increases the boiling point. If you have 1 cup
(8 fl. oz. = 250 mL = 250 g) of H2O, how
much NaCl should you add in order to raise
the boiling point to 105�C?

Answer 1

ΔTb = molality * Kb * i

molality=moles solute/kg solvent

http://chemistry.about.com/od/solutionsmixtures/a/boilingpointele.-NxZ.htm

Answer 2

142.5