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A 0.0230 g sample of an unknown was dissolved in 2.260 g of benzene. The molality of this solution, determined by freezing point depression, was 0.0408 m. What is the molecular weight of the unknow substance?

1 answer

delta T = Kf*m
Solve for m

m = mols/kg solvent
Solve for mols

mols = grams/molar mass
Solve for molar mass.

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