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April 16, 2014

Homework Help: Chemistry

Posted by Emma on Monday, January 21, 2013 at 7:27pm.

Thyroxine, an important hormone that controls the rate of metabolism in the body can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0 g of benzene, the freezing point of the solution could be measured as 5.144C. Pure benzene freezes at 5.444C and has a value for the molal freezing-point-depression constant of Kf of 5.12C/m. What is the approximate molar mass of thyroxine?

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