Pure benzene freezes at 5.45°C. A solution containing 7.24 g of C2Cl4H4 in 115.3 g of benzene was observed to freeze at 3.55°C. From these data, calculate the molal freezing point depression constant of benzene.

What is the molar mass of a nonelectrolyte if 6.02 gramsdissolved in 30.0 grams of benzene freezes at -1.55 �C? Thefreezing point of pure benzene is 5.50 �C and the freezing pointdepression constant, K_fp, is -5.12�C/m.

146 g/mol
187 g/mol
276 g/mol
663 g/mol

Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.454g of thyroxine is dissolved in 10.0g of benzene, the feezing point depression of the solution was 0.300 degrees celcius. pure benzene freezes has a value for the molal freezing point depression constant, Kf, of 5.12⁰C/m what is the approximate molar mass of thyroxine?