Question

Calculate the freezing point and boiling point of a solution that contains 56.8 g NaCl and 32.0 g KBr dissolved in 750.3 mL H2O.

Answer 1

mols NaCl = grams/molar mass
mols KBr = grams/molar mass
total mols = mols NaCl + mols KBr.
m = total mols/kg solvent

delta T = i*Kf*m
i = 2
Subtract delta T from zero to find new freezing point.

delta T = i*Kb*m
Add delta T to 100 to find new boiling point.