Low-temperature thermodynamic properties of n-propyl-, n-butyl-, and n-decyl-substituted cyclopentanes

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

DOI:https://doi.org/10.1021/j100886a001· OSTI ID:7305435

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

The heat capacities in the range 12 to 370/sup 0/K, heats of fusion, triple points, and purity of n-propylcyclopentane, n-butylcyclopentane, and n-decylcyclopentane were measured in an adiabatic calorimeter. From these data the thermodynamic functions, (G/sub s/ - H/sup 0//sub 0/)/T, (H/sub s/ - H/sup 0//sub 0/)/T, H/sub s/ - H/sup 0//sub 0/, S/sub s/, and C/sub s/, were calculated for the solid and liquid states at selected temperatures in the range 10 - 370/sup 0/K. The entropies of these compounds in the ideal gas state at 298.15/sup 0/K were calculated using a Cox equation fitted to vapor pressure data from the literature. The average entropy increments per methylene group from n-butyl- through n-decylcyclopentane in the liquid and ideal gas states were found to be 7.76 and 9.33 cal. deg./sup -1/ mole/sup -1/, respectively, in close agreement with the constant value for higher members of the normal alkane series of hydrocarbons.

• Research Organization: Bureau of Mines, Bartlesville, OK
• OSTI ID: 7305435
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 69:2; 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
CYCLOALKANES
ENTHALPY
ENTROPY
HYDROCARBONS
LOW TEMPERATURE
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
VERY LOW TEMPERATURE