Calculate the molar mass of an unknown molecular compound mixed with solid camphor C10H16O, heated and then cooled giving the following data. show all steps in calculation.

mass of unknown: 0.195 g
Tf(camphor)= 179.8 degree C
Kf(camphor)=-40.0 degree C/m
mass of camphor-25.03g
Tf(solution)=176.7 degree C

1 answer

delta T = Kf*m
delta T = 179.8-176.7 = ?
Kf = from your table.
Solve for molality.

Then m = mols/kg solvent
m from above.
kg solvent = 0.02503 kg
Solve for mols.

Then mols = grams/molar mass
mols from above.
mass unknown = 0.195g
Solve for molar mass.