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.

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.

DrBob222 · Answer

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.

Anonymous · Answer

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