(°C/ m ) Normal freezing point ( °C) (°C/ m ) Normal boiling point ( °C) Solvent

Question

(°C/m)

Normal freezing

point (°C)

(°C/m)

Normal boiling

point (°C)

Solvent Formula Kf value*

(°C/m)

Normal freezing

point (°C)

Kb value

(°C/m)

Normal boiling

point (°C)

water H2O 1.86 0.00 0.512 100.00 benzene C6H6 5.12 5.49 2.53 80.1 cyclohexane C6H12 20.8 6.59 2.92 80.7 ethanol C2H6O 1.99 –117.3 1.22 78.4 carbon
tetrachloride   CCl4 29.8 –22.9 5.03 76.8 camphor   C10H16O 37.8 176
Menthol is a crystalline substance with a peppermint taste and odor. When 0.881 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 4.70 "C. The freezing point and Kf constant for cyclohexane can be found here. can be found here Calculate the molar mass of menthol. Number g/mol

Explanation / Answer

molality of menthol=(0.881/M)/0.025=35.24/M

Freezing point depression=mKf=35.24/M*20.8=4.70

M=155.95=156

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