Homework Help: chemistry

Posted by anna on Friday, February 24, 2012 at 10:12pm.

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

chemistry - DrBob222, Friday, February 24, 2012 at 10:19pm
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.

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