Heat Capacities of α,ω-Dichloroalkanes at Temperatures from 284.15 K to 353.15 K and a Group Additivity Analysis

Abstract

Heat capacities at constant pressure of five R,ω-dichloroalkanes (1,2-dichloroethane, 1,3-dichloropropane, 1,4-dichlorobutane, 1,5-dichloropentane, 1,6-dichlorohexane) were measured at temperatures ranging from 284 K to 353 K by using a highly sensitive Tian-Calvet differential scanning microcalorimeter (DSC). Changes in the standard procedures increased the accuracy of C p measurements. The influence of the evaporation heat effect on the C p value is analyzed. In the described method, the uncertainty of the measurements is estimated to be (0.15% for uncertainties arising solely from the measurement system and method. The group contributions to C p for CH 2 and Cl and their temperature dependence were determined by a group additivity analysis.

Excess molar heat capacities for (1-butanol+1,3-butanediol) at temperatures from (285 to 353) K

“…The uncertainty of the measurements was estimated to be ±0.15% excluding the effects of sample impurities [3], however, it is interesting to note that in the opinion of Rudtsch [4] this is an optimistic estimation. Details about the apparatus and the experimental procedure have been described elsewhere [3].…”

Molar heat capacities for (1-butanol+1,4-butanediol, 2,3-butanediol, 1,2-butanediol, and 2-methyl-2,4-pentanediol) as function of temperature

“…The uncertainty of the measurements was estimated to be ±0.15% excluding the effects of sample impurities [9]. Details about the apparatus and the experimental procedure have been described elsewhere [9].…”

Thermodynamic and Acoustic Properties of Mixtures of Dibromomethane + Heptane

“…The uncertainty of the measurements was estimated to be 0.15 %. Details of the applied procedures and the calibration have been described previously [18].…”