Question

Menthol is a crystalline substance with a peppermint taste and odor. When 1.45 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 7.73 °C. The freezing point and Kf constant for cyclohexane can be found here. Calculate the molar mass of menthol.

Answer 1

use the formula: \(\Delta T=i*m*K_{f}\)

find molality, then expand the formula ; m=\(\dfrac{n_{solute}}{kg_{solvent}}=\dfrac{\dfrac{m_{menthol}}{M_{menthol}}}{kg_{solvent}}\)


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