Question

A 15.0 g sample of an unknown compound is dissolved in 100.0 g of benzene. The boiling point is raised 2.67 oC above the boiling point of pure benzene. What is the molar mass of the sample? Kb for benzene is 2.67oC/m.

Answer 1

delta T = Kb*molality
Solve for molality = m

m = moles solute/kg solvent
Solve for moles solute

moles solute = grams solute/molar mass solute.
Solve for molar mass.

Answer 2

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