Suppose that you add 27.6 g of an unknown molecular compound to 0.250 kg of benzene, which has a  KfKf  of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 3.56 oC compared to pure benzene.   What is the molar mass (in g/mol) of the unknown compound?

Chemistry: Principles and Reactions
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Author:William L. Masterton, Cecile N. Hurley
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Problem 50QAP: A compound contains 42.9% C, 2.4% H, 16.6% N, and 38.1% O. The addition of 3.16 g of this compound...
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Suppose that you add 27.6 g of an unknown molecular compound to 0.250 kg of benzene, which has a 

KfKf

 of 5.12 oC/m. With the added solute, you find that there is a freezing point depression of 3.56 oC compared to pure benzene.

 

What is the molar mass (in g/mol) of the unknown compound?

 
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