Menthol is a crystalline substance with a peppermint taste and odor. When 1.19 g of menthol...

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Chemistry

Menthol is a crystalline substance with a peppermint taste andodor. When 1.19 g of menthol is dissolved in 25.0 g of cyclohexane,the freezing point of the solution is lowered by 6.34 âˆ˜ C. Look upthe freezing point and K f constant for cyclohexane in theColligative Constants table. Calculate the molar mass ofmenthol.
Solvent Formula K_f value*
(Â°C/m)
Normal freezing
point (Â°C)
K_b value
(Â°C/m)
Normal boiling
point(Â°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 â€“117.3 1.22 78.4
carbon
tetrachloride CCl₄ 29.8 â€“22.9 5.03 76.8
camphor C₁₀H₁₆O 37.8 176

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3.8 Ratings (392 Votes)

Mass of menthol is 119 gMenthol is a nonelectrolyte and hence has vant Hoff factor i1Now the depression in freezing point for the solution is givenasNow the See Answer

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Solvent	Formula	K_f value* (Â°C/m)	Normal freezing point (Â°C)	K_b value (Â°C/m)	Normal boiling point(Â°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	â€“117.3	1.22	78.4
carbon tetrachloride	CCl₄	29.8	â€“22.9	5.03	76.8
camphor	C₁₀H₁₆O	37.8	176