Question 10 of 18 IncorrectIncorrect Incorrect Incorrect General Chemistry 4th E

Question

Question 10 of 18 IncorrectIncorrect Incorrect Incorrect General Chemistry 4th Edition Map University Science Books presented by Sapling Learning Menthol is a crystalline substance with a peppermint taste and odor. When 1.06 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 5.64 "C. The freezing point and Ki constant for cyclohexane can be found here. Calculate the molar mass of menthol. Number 3332.33 g/mol There is additional feedback available View this feedback by clicking on the bottom divider bar. Click on the divider bar again to hide the additional feedback. Close O Previous Give Up & View Solution # Try Again O Next -el Exit Explanation

Explanation / Answer

kf for cyclohexane = 20oC / mol

Freezing point depression = kf . m

where m is molality

molality = no. of moles of menthol / mass of cyclohexane in kg

So here :

5.64 = 20 x m

m = 0.282 m

So now :

0.282 = n / 0.025

n = 0.00705 moles

So the moalr mass of menthol = 1.06 / 0.00705

= 150.35 g/ mol

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