Homework Help: Chemistry

Posted by James on Thursday, February 10, 2011 at 1:01pm.

A solution contains 3.75g of nonvolatile pure hydrocarbon in 95g acetone. The boiling points of pure acetone and the solution are 55.95C and 56.50C, respectively. The molal boiling point constant of acetone is 1.71 C*kg/mol. What is the molar mass of the hydrocarbon?

Chemistry - DrBob222, Thursday, February 10, 2011 at 4:47pm
delta t = Kb*molality
Solve for molality

molality = moles/kg solvent
Solve for moles

moles = grams/molar mass
Solve for molar mass.
Chemistry - PeoplebeTrippin, Monday, March 4, 2013 at 3:35am
120g/mol
Chemistry - PeoplebeTrippin, Monday, March 4, 2013 at 3:35am
120g/mol

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