Thermodynamic properties of n-propyl-, n-butyl-, and n-decyl-substituted cyclohexane from 10 to 370/sup 0/K

Journal Article · Fri Jan 01 04:00:00 EST 1965 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100890a048· OSTI ID:7098524

Finke, H L; Messerly, J F; Todd, S S

Heat capacities from 12 to 370/sup 0/K, heats of fusion, triple points, and purities of n-propyl-cyclohexane, n-butylcyclohexane, and n-decylcyclohexane were determined by adiabatic calorimetry, and the data were used to calculate the thermodynamic functions (G/sub 8/-H/sup 0//sub 0/)/T, (H/sub 8/-H/sup 0//sub 0/)/T, H/sub 8/-H/sup 0//sub 0/, S/sub 8/, and C/sub 8/, for the solid and liquid states at selected temperatures in the range 10 to 370/sup 0/K. From the Clapeyron equation and Cox equations fitted to vapor pressure data from the literature, the entropies of these compounds in the ideal gas state at 298.15/sup 0/K were calculated. The average entropy increments per methylene group between n-butyl- and n-decylcyclohexane in the liquid and ideal gas states were found to be 7.78 +- 0.03 and 9.35 +- 0.04 cal. deg./sup -1/ mole/sup -1/, respectively. These values agree well within experimental error with the constant values for the corresponding higher members of the n-alkane series of hydrocarbons and with the average value obtained from n-butyl- and n-decylcyclopentanes.

• Research Organization: Bartlesville Petroleum Research Center, OK
• OSTI ID: 7098524
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 69:6; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKANES
CALORIMETRY
CYCLOALKANES
ENTHALPY
FUSION HEAT
HYDROCARBONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
VERY LOW TEMPERATURE