Thank you for the opportunity to help you with your question!
for finding molar mass one should know the freezing points of pure liquid and its solution with water and any other substance freezing point depression.
then use this formula delta Tf = Kf* molality delta Tf is the difference between freezing point.
Kf is constant which is -1.86
you will get molality of the unknown liquid
Please let me know if you need any clarification. I'm always happy to answer your questions.
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Jul 7th, 2015
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