Volume 24, Issue 5, September 1995
Index of content:
24(1995); http://dx.doi.org/10.1063/1.555961View Description Hide Description
A new representation of the viscosity of ammonia is presented. The representative equations are based on a set of experimental data selected as a result of a critical assessment of the available information. The validity of the representation extends from 196 K to the critical temperature for both liquid and vapor phases. In the supercritical region the temperature range extends to 680 K for pressures at or below ambient and to 600 K for pressures up to 50 MPa. The accuracy of the representation varies from 0.5% for the viscosity of the dilute gas phase at moderate temperatures to about 5% for the viscosity at high pressures and temperatures. Tables of the viscosity generated by the correlating equation at selected temperatures and pressures and along the saturation line are presented to provide easy reference as well as for the validation of computer codes.
24(1995); http://dx.doi.org/10.1063/1.555969View Description Hide Description
Equilibrium constants and enthalpy changes for reactions catalyzed by the lyase class of enzymes have been compiled. For each reaction the following information is given: the reference for the data; the reaction studied; the name of the enzyme used and its Enzyme Commission number; the method of measurement; the conditions of measurement(temperature, pH, ionic strength, and the buffer(s) and cofactor(s) used); the data and an evaluation of it; and, sometimes, commentary on the data and on any corrections which have been applied to it or any calculations for which the data have been used. The data from 106 references have been examined and evaluated. Chemical Abstract Service registry numbers are given for the substances involved in these various reactions. There is a cross reference between the substances and the Enzyme Commission numbers of the enzymes used to catalyze the reactions in which the substances participate.
24(1995); http://dx.doi.org/10.1063/1.555964View Description Hide Description
Recommended thermochemicalproperty values, Δf H°, Δf G°, and S° for the aqueous ions of iron, Fe2+ and Fe3+, are given at 298.15 K in SI units. They are consistent with the CODATA Key Values for Thermodynamics. The values are: Δf H°=−90.0±0.5 kJ⋅mol−1, Δf G°=−90.53±1.0 kJ⋅mol−1, S°=−101.6±3.7 J⋅mol−1⋅K−1 for Fe2+(ao) and Δf H°=−49.0±1.5 kJ⋅mol−1, Δf G°=−16.28±1.1 kJ⋅mol−1, S° =−278.4±7.7 J⋅mol−1⋅K−1 for Fe3+(ao). The evaluation involves the analysis of the enthalpy changes, Gibbs energy changes, and the entropy measurements for all key substances in the key network. A consistent set of thermochemicalproperty values is given for FeOOH(cr, Goethite), FeCl2(cr), FeCl3(cr), FeBr2(cr), FeBr3(cr), FeI2(cr), and FeSO4⋅7H2O(cr), as well as ‘‘reconstituted’’ recommended process values with uncertainties involving these substances. All recommended values are also given for a standard state of p°=1 atm. A computer based reaction catalog of measurements accompanies the text analysis.