Volume 31, Issue 1, March 2002
Index of content:
IUPAC-NIST Solubility Data Series. 77. Nitroalkanes With Water or Organic Solvents: Binary and Multicomponent Systems31(2002); http://dx.doi.org/10.1063/1.1417522View Description Hide Description
The mutual solubilities and liquid-liquid equilibria of binary and multicomponent systems composed of nitroalkanes with solvents are reviewed. The solvents (mainly in liquid phase) include water, inorganic compounds and a variety of organic compounds such as hydrocarbons, halogenated hydrocarbons, alcohols, acids, esters, and nitrogen compounds. A total 81 binary, 21 ternary, 2 quaternary and 1 five component systems whose properties were described in the chemical literature through 1998 are compiled. For 14 systems sufficient data were available to allow critical evaluation. All data are expressed as mass and mole fractions as well as the originally reported units. Similar reviews of gas, liquid and solid solubilities for other systems have been within the Solubility Data Series. This is volume 77 of this series.
31(2002); http://dx.doi.org/10.1063/1.1420703View Description Hide Description
Experimental data on the enthalpies of formation of chloromethanes, chloroethynes, chloroethenes, and chloroethanes are critically reviewed. Enthalpy of formation values for the C1 and C2 chlorinated hydrocarbons are highly cross-linked by various measuredreaction equilibria and currently available sets of values are not internally self-consistent. It is shown that the early static bomb combustioncalorimetry studies on highly chlorinated compounds generally give enthalpies of formation that are systematically more positive than later values derivable from rotating bomb combustion or equilibria studies. Those previously recommended values which were based mainly on the early static bomb work therefore need substantial revision. On the basis of more recent literature data obtained with rotating bomb combustioncalorimetry, together with analyses of literature data on other reactionenthalpies and equilibria involving chlorinated hydrocarbons, an updated self-consistent set of values for closed shell chlorinated C1 and C2 hydrocarbons (25 compounds) is recommended. Data on the enthalpies of vaporization are also reviewed and values of and are recommended. The presently suggested enthalpies of formation for highly chlorinated alkenes and alkanes (particularly and ) are significantly (8–15 kJ mol−1) more negative than given by most previous evaluators. Values for the chloroethynes are 10–25 kJ mol−1 more positive than given in previous reviews and more limited changes are suggested for other compounds in the series.
31(2002); http://dx.doi.org/10.1063/1.1430231View Description Hide Description
A new formulation has been developed to represent the vapor pressure of heavy water from its triple point to its critical point. This work takes advantage of several developments since the publication of the best previous formulation: the availability of some new data in the lower part of the temperature range, the adoption of the ITS-90 temperature scale, and the adoption of recommended values for the critical constants by the International Association for the Properties of Water and Steam (IAPWS). The new formulation fits the available data within their scatter across the entire temperature range, and is constrained to pass through the values recommended by IAPWS for the critical point. The previous formulation can be made to provide a similarly good fit if its input temperatures are converted from ITS-90 to IPTS-68 before the vapor pressure is computed. The new formulation offers the advantage of computation without having to perform a temperature conversion.
–Second Virial Coefficients Viscosity and Self-Diffusion of the Gases: and Determined by Means of an Isotropic Temperature-Dependent Potential31(2002); http://dx.doi.org/10.1063/1.1433462View Description Hide Description
We present results on self-consistent calculations of second –virial coefficients viscosity data and diffusion coefficients for eleven heavy globular gases: boron trifluoride carbon tetrafluoride silicon tetrafluoride carbon tetrachloride silicon tetrachloride sulfur hexafluoride molybdenum hexafluoride tungsten hexafluoride uranium hexafluoride tetramethyl methane ( TMM), and tetramethyl silane ( TMS). The calculations are performed mainly in the temperature range between 200 and 900 K by means of isotropic −6 potentials with temperature-dependent separation and potential well depth The potential parameters at (ε, n) and the enlargement of the first level radii δ are obtained solving an ill-posed problem of minimizing the squared deviations between experimental and calculated values normalized to their relative experimental error. The temperature dependence of the potential is obtained as a result of the influence of vibrational excitation on binary interactions. This concept of the isotropic temperature-dependent potential (ITDP) is presented in detail where gaseous will serve as an example. The ITDP is subsequently applied to all other gases. This approach and the main part of the results presented here have already been published during 1996–2000. However, in some cases the data are upgraded due to the recently improved software ( ) and newly found experimental data ( ).
31(2002); http://dx.doi.org/10.1063/1.1448482View Description Hide Description