Group additivity for partial molal heat capacities and volumes of alkanes in methanol at 25°C |
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Authors: | Raymond N French Cecil M Criss |
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Institution: | (1) Department of Chemistry, University of Miami, P.O. Box 249118, 33124 Coral Gables, Florida |
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Abstract: | A flow heat capacity calorimeter and a flow vibrating tube densimeter have been used to measure the apparent molal heat capacities and volumes of 14 linear and branched alkanes in methanol at 25°C. These quantities have been extrapolated to infinite dilution to obtain the standard partial molal heat capacities and volumes. The C
p2
o
and V
2
o
data can be expressed by equations having the general form: Y=AY+ Nk Yk+ (steric factors), where AY is solute independent and the Yk terms are the individual group contributions. A rationale for use of the above equation is presented. |
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Keywords: | Partial molal heat capacities partial molal volumes group additivity alkanes methanol nonelectrolytes |
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