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Benzene – diethyl ketone association. The excess molar enthalpy of (cyclohexane + diethyl ketone)(g) and (benzene + diethyl ketone)(g) from temperatures 373.2 K to 423.2 K

✍ Scribed by C.J. Wormald; C. Mathonat

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
182 KB
Volume
30
Category
Article
ISSN
0021-9614

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✦ Synopsis

cyclohexane q diethyl ketone g and benzene q diethyl ketone g at standard atmospheric pressure over the temperature range 373.2 K to 423.2 K. The non-ideality of the cyclohexane and benzene was fitted using the Kihara potential, and that of the diethyl ketone using the Ž Stockmayer potential. Cross-terms were calculated using the equation s 1 y 12 .Ž . 1r 2 Ž . Ž . k , and to fit the measurements on cyclohexane q diethyl ketone g the value 12 11 22

Ž .

E Ž 1yk s1.13 was needed. This value was used to calculate H for benzene q diethyl 12 m .

y1

.Ž . ketone g , but the experimental values were found to be about 25 J mol smaller. The difference between calculated and experimental values was described in terms of a quasichemical model which, for the benzene᎐diethyl ketone interaction, yielded a value of the Ž . y 1 equilibrium constant K 298.15 K s 0.347 MPa and an enthalpy of association ⌬ H s 12 12

. y1 Ž . y 19.4 " 3 kJ mol . This value of ⌬ H is larger than that found for the benzene᎐dimethyl 12 . y1 Ž . ketone interaction, ⌬ H s y 16.4 " 2 kJ mol . These interactions with benzene could be 12 due to quadrupole forces which are stronger for interactions between a polar molecule and benzene than between a polar molecule and cyclohexane. While the dipole moments of dimethyl ketone and diethyl ketone are much the same, diethyl ketone is likely to have a larger quadrupole moment.

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