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saplinglearning.com/ibiscms/modibiswiewphp?id 3755986 6/12/2017 11:55 PM CA 88.61100 G 6/12/2017 12:51 PM attempts Score Print Calculator Periodic Table Question 5 of 16 General Chemistry 4th Editoo University Science Books presented Menthol is a crystalline substance with a peppermint taste and odor. When 1.49 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 7.96 C. The freezing point and Kr constant for cyclohexane can be found here. Calculate the molar mass of menthol. 149.75 g/ mol There is a hint available! bottom divider bar. Click on the divider bar again to hide the hint. AO Previous 8 Give Up & View solution 2 Check Answer 0 Next E Hint

Explanation / Answer

The equation relating freezing point depression and morality of solute is

Tf = Kf m

where,

Tf = Freezing point depression , 7.96°C

Kf = Freezing point depression constant, 20.2°C kg/mol

m = molality ofsolute

m = Tf/Kf

= 7.96°C/20.2°C kg/mol

= 0.39405mol/kg

Mass of solvent = 0.02500kg

No of mole of solute in 0.02500kg =0.39405 ×0.02500= 0.009851

Molar mass = mass /no of mol

= 1.49g/0.009851mol

= 151.25g/mol

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