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Benzene–dichloromethane association. The excess molar enthalpy of (cyclohexane + dichloromethane)(g) and (benzene + dichloromethane)(g) from the temperature 353.2 K to 453.2 K

✍ Scribed by C.J. Wormald; P.W. Johnson

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

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✦ Synopsis

cyclohexane q dichloromethane g and benzene q dichloromethane g at standard Ž . atmospheric pressure over the temperature range 353.2 to 453.2 K. The non-ideality of the cyclohexane and benzene was fitted using the Kihara potential, and that of the dichloromethane using the Stockmayer potential. Cross-terms were calculated using the

, and to fit the measurements on cyclohexane q 12 12 11 22

.Ž . Ž . dichloromethane g the value 1 y k s 1.005 was needed. This value was used to calculate 12 E

Ž

. Ž . H for benzene q dichloromethane g , and the calculated values were found to be positive m

Ž

. Ž . and about as large as those for cyclohexane q dichloromethane g . However the .

y1 experimental values are negative, and at T s 353.2 K are about 50 J mol below the values Ž . Ž . for cyclohexane q dichloromethane g . The difference between the calculated and experimental values was described in terms of a quasi-chemical model which, for the benzene᎐dichloromethane interaction, yielded a value of the equilibrium constant y1 . y1 Ž . Ž . K 298.15 K s 0.323 MPa and an enthalpy of association ⌬ H s y 12.8 " 3 kJ mol . 12 12

This value of ⌬ H is attributed to charge transfer between benzene and dichloromethane 12 which is not present in the cyclohexane᎐dichloromethane interaction.

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