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## Homework Statement

Freezing point depression question[/B]

student determines molar mass of acetone using the method used in this experiment. She found that the eq temp of water and ice was 1 deg C. She then adds 11.1g of the sample to mixture and temp falls to -3 deg C. Mass of solution was 90.4g

What is the molality of the acetone using the experimental data and equation delta T_f = mk_f?

## Homework Equations

Im lost on how to get moles without using the MM from formula for acetone?

## The Attempt at a Solution

I know that T_f = 4deg C

also that m = moles solute / kg solvent

Also (if this is useful) that mass % = 12.28% acetone

also that kg of the solution will be = .904kg

thanks for any help