Heat Contents of Molten Zinc Chloride and Bromide and the Molecular Constants of the Gases

Abstract

The heat contents of zinc chloride and bromide were measured from room temperature to about 700°C. The heat capacities (cal/mole deg) of the solids were: 14.5+5.5×10—3T and 12.6+10.4×10—3T°K; those of the liquid were 24.1 and 27.2 cal/mole; and the heats of fusion were 2.45 and 3.74 kcal/mole. These thermal data, when combined with the entropies of evaporation of F. J. Keneshea and D. Cubicciotti [J. Chem. Phys. (to be published)], resulted in absolute gaseous entropies that were 5 eu larger than the values calculated from molecular constant data. The discrepancy can be resolved if the molecules are bent or have lower bending frequencies than the literature values.

High Temperature Properties and Decomposition of Inorganic Salts Part 3, Nitrates and Nitrites

“…77, and the en.thalpy and entropy of vaporization by baH vap •(1 mol-I )= 143,344 -41.84T, baS vap (J deg-I mol-I) = 370.9-96 log T. He also calculated values offef for the salt and these have been used in this monograph. The corresponding data for TbO are those of Cubicciotti and Eding [41]. Ti(NO:d4 is a covalent salt, stable at least to its melting point at 331 K [48].…”

Vibrational Spectra, Isotopic Effects, Force Constants and Geometry of Matrix Isolated Binary and Mixed Zinc Dihalides

“…Two stretching force constants (J and f,, for ZnX,,J andf, for ZnXY) as well as the bending force constant can be evaluated from the average band positions. However, the availability of isotopic fine structure as well as some calorimetrically measured entropy values [2] (ZnBr,) additional spectroscopic parameters from the experimental data, specifically the interactions force constant 1;, of the mixed dihalides and the bond-bond angle of all molecules. The latter quantity is of interest as it has structural, bonding and thermodynamic implications.…”

“…Matrix deposition conditions: MIA -500; deposition rate = 1.1 pm/min; thickness: 84 pm: deposition temperature: 16 K. ii. The v,(a') band of CH,CHO:Ar which was assigned and observed under low resolution at 1349 c m -' by Hollenstein [2] shows under high resolution a splitting into three partly overlapping bands at 1348.690 cm -'. 1348.919 cm ~ ', 1349.248 cm-'.…”

Facile Strategy to Low-Cost Synthesis of Hierarchically Porous, Active Carbon of High Graphitization for Energy Storage

“…On the other hand, molten zinc chloride (ZnCl 2 ) played several roles during the process. First, it acted as a heating media of large thermal capacity (typical heat capacity of ZnCl 2 is 80.79 J/mol at 600 °C) to provide homogeneous heating of the carbon precursor to the desired temperature for the endothermic carbonization reaction. Second, the molten salt acted as a soft template to introduce pores to the in situ formed carbon, as confirmed in our previous studies. − Third, the molten salt acted as a corrosive medium to create surface defects over the as-formed carbon material.…”