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Hi. This is a question based on a lab I did.

We mixed an unknown solute in a solution of pure cyclohexane. Based on numbers we got from our lab, we were asked to find the molal concentration of the unknown. The freezing point of the unkown was found to be 1.5 C and the freezing point of the cyclohexane was found to be 6.7 C. Therefore Delta Tf is 5.2 C. the Kf of the cyclohexane was found to be 12.5 C/molality.

so i found the molality of the unkown to be .416 mol/kg

we are asked now to find the mass of the unkown that would dissolve in 1kg of cyclohexane to give the same molal concentration that we had in our solution.

i'm not seeing how the heck i can find mass from this the information I have.

We will lastly have to find the molar mass of the unkown. I can't find this until i have figured out the mass of the unkown

any help would be appreciated! thank you

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3. The attempt at a solution

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# Homework Help: Molality to mass

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