2. Hydrophobic/Entropic effect. According to the paper by Levitt et al., the transfer of a hydrophobic chemical moiety f

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2 Hydrophobic Entropic Effect According To The Paper By Levitt Et Al The Transfer Of A Hydrophobic Chemical Moiety F 1 (191.38 KiB) Viewed 57 times

2. Hydrophobic/Entropic effect. According to the paper by Levitt et al., the transfer of a hydrophobic chemical moiety from water into a hydrophobic environment results in a net negative change of free energy (AG), which is proportional to the surface area of the moiety with a constant of about -25 cal.mol-1-A-2. The surface areas of the methylene group (-CH2-) and methyl group (-CH3) are as follows 80 A2 and 150 Å?, respectively. If one mole of hexane that has been completely dispersed into water is allowed to come to rest/equilibrium, the hexane molecules will separate into a new hydrophobic organic phase. a) What is the magnitude of the hydrophobic effect, or in other words the change in free energy in the process? b) Kinetically, the hexane molecules still undergo very rapid translational motions. If the temperature remains the same, do you think the translational velocity of the hexane molecules will slow down in the organic phase? What is the physical force or forces that hold the molecules together in the organic phase?