The Heat Capacity and Entropy, Heats of Fusion and Vaporization and the Vapor Pressure of Butene-1. The Zero Point Entropy of the Glass. The Entropy of the Gas from Molecular Data

Abstract

It has been possible to crystallize butene-1 for the first time and thus obtain thermal data on the crystal down to 11.5°K. leading to entropies of crystal, liquid and gas. In addition, it has been possible to cool the glass down to 13°K. and obtain a value for the residual entropy in the glass at the absolute zero.The present paper records the experimental data and conclusions from this work. ExperimentalPurification of Butene-1 Samples.-The sample of butene-1 on which the heat capacities in series I-VIII and the heats of fusion were measured was obtained from Professor M. R. Fenske, of the Petroleum Refining Labora-

Excess entropies and related quantities in glass-forming liquids

“…Z( 1 + KT2/T) exp(-KT2/T) (6) and, finally ASg/ASm = (1 + KT2/Tg) exp(-KY)/(l + KT2/Tm) (60 where Y = TJT" -TJTm.…”

Effective (n-6) Lennard-Jones Potentials with Temperature-Dependent Parameters Introduced for Accurate Calculation of Equilibrium and Transport Properties of Ethene, Propene, Butene, and Cyclopropane

“…Systematic deviations are hardly detectable in these cases. All data were used as given by the authors except for the results on 1-butene which are obtained from heat capacity and vapor pressure measurements by Aston et al 92 Here we found that too many assumptions prevent extraction of reliable B-data from these kinds of experiments. The final potential parameters at T ) 0 K and the root-mean-square deviations rms are given in Table 2.…”

Heat content, free-energy function, entropy, and heat capacity of ethylene, propylene, and the four butenes to 1,500 degrees-K

“…The value for the entropy of I-butene in the ideal gaseous state at 266.91° K obtained by application of the third law to appropriate calorimetric data is 70.87 ± 0.20 cal/deg mole [18].…”