Question

Problem 3. (15 pts) The following data contain thermodynamic data for the transfer of small nonpolar compounds from a dilute aqueous solution to the neat (pure) liquid at 25°C. Compound sº(1)-sº(aq) J/molók 96 104 108 Gº(1)-Gº(aq) kJ/mol -25.0 -28.7 -32.4 -19.2 -22.6 -25.9 -28.8 -6.6 -10.0 -13.5 C4C10 C5C12 C6C14 C6H6 C.HSCH C6H5C2H5 C6H5C3H6 C3H7OH C4H,OH CsH11OH Hº(I)-Hºaq) kJ/mol 3.3 2.1 0 -2.1 -1.7 -2.0 -2.3 10.1 9.4 7.8 59 71 79 88 56 65 71 a) For each class of compound, are the slopes of the AG versus # CH2 groups the same? Should the slopes be similar? Justify your answer. b) Estimate the Transfer Free Energies for the following terminal groups on the basis of your plots in Part a. -CH3 -C6H6 -OH

Answer 1

As it is seen from the graph -

& Graph1 1 Title Change in G value 35ATTTTTTTTTTTTTTTTTTTTTTTT -1 2 3 # of CH2 group

A. It is very clear that each class of compound have same slope that means change in the G value for each class of compounds are similar.

Slope for Class 1- (Alkane) =

(y-intercept) = -17.6 +/- 6.74184308863645e-19

(slope) = -3.7 +/- 2.16840434497101e-19

Slope for Class 2- (Benzene ) =

(y-intercept) = -22.6666666666667 +/- 0.149071198499984

(slope) = -3.1 +/- 0.115470053837924

Slope for Class 3 - (Alcohol) =

(y-intercept) = 0.316666666666667 +/- 0.0897527467855748

(slope) = -3.45 +/- 0.0288675134594812