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?

Answer 1

delta t = Kb*molality
Solve for molality

molality = moles/kg solvent
Solve for moles

moles = grams/molar mass
Solve for molar mass.

Answer 2

120g/mol

Answer 3

i have no response

Answer 4

will be slightly lower than 56.50 degree Celsius