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Benzene – diethyl ether association. The excess molar enthalpy of (cyclohexane + diethyl ether)(g) and (benzene + diethyl ether)(g) from temperatures 353.2 K to 423.2 K

✍ Scribed by J. Bowles; M. Lacey; C. Mathonat; C.J. Sowden; C.J. Wormald

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

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✦ Synopsis

cyclohexane q diethyl ether g and benzene q diethyl ether g at standard atmospheric pressure over the temperature range 353.2 K to 423.2 K. The non-ideality of the cyclohexane and benzene was fitted using the Kihara potential, and that of the diethyl ether using the Ž Stockmayer potential. Cross-terms were calculated using the equation s 1 y

and to fit the measurements on cyclohexane q diethyl ether g the value 12 11 22

Ž .

E Ž 1yk s0.97 was needed. This value was used to calculate H for benzene q diethyl 12 m .

y1

.Ž . ether g , but the experimental values were found to be about 10 J mol less positive. The difference between the calculated and experimental values was described in terms of a quasi-chemical model which, for the benzene᎐diethyl ether interaction, yielded a value of the Ž . y 1 equilibrium constant K 298.15 K s 0.099 MPa , and an enthalpy of association ⌬ H s 12 12 . y1 Ž . y9.5 " 3 kJ mol . This value of ⌬ H is attributed to dipole᎐quadrupole and 12 quadrupole᎐quadrupole forces which are stronger for the benzene᎐diethyl ether interaction than for the cyclohexane᎐diethyl ether interaction.

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