Question

Cocaine is a non-electrolyte that has a molecular weight of 303.4 g/mole. How many grams must be dissolved in 25.0 mL of Chloroform (density = 1.484 g/mL) to raise its boiling point to 65.5 Celsius? The boiling point of pure Chloroform is 61.2 Celsius.
Kb Chloroform = 3.62 Celsius/m

Answer 1

Calculate delta T for CH3Cl3.
delta T = Kb*m
Solve for m

m = moles/kg solvent
Solve for moles.

moles cocaine = grams/molar mass
Solve for grams.