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saplinglearning.com Califor Sapling 178-CHEM111-01-436o Dashboard-My Study Life rsity, Chico-CHEM 111-Fall17-HILLYARD Activities and Due Dates HW 12 2/11/2017 09:55 AM 3.9/10 01 2/7/2017 01:31 PM Print Calculator Periodic Table on 22 of 34 neral Chemistry 4th Edition University Science Books presented by Sapling Learning Menthol is a crystalline substance with a peppermint taste and odor. When 0.459 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 2.45 . The freezing point and constant for cyclohexane can be found here. Calculate the molar mass of menthol. Number g/mol int O Previous Give Up & View Solution e Check Answer

Explanation / Answer

DTf = i*kf*m

DTf = T0-Tf = 2.45

DTf = i*Kf*m

i = vanthoff factor of menthol = 1

Kf = frreezing point constant of cyclohexane = 20.2 C/m

molality(m) = (w/mwt)*(1000/W)

w = amount of menthol = 0.459 g

M = molarmass of menthol = x g/mol

W = amount of cyclohexane = 25 g

             = (0.459/x)*(1000/25)

          
2.45 = 1*20.2*(0.459/x)*(1000/25)

x = molarmass of menthol = 151.4 g/mol

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