摘要:

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. ©1995 American Institute of Physics and American Chemical Society.

ISSN:0047-2689    

DOI:10.1063/1.555961

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

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. ©1995 American Institute of Physics and American Chemical Society.

ISSN:0047-2689    

DOI:10.1063/1.555969

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Recommended thermochemical property values, &Dgr;fH°, &Dgr;fG°, andS° 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: &Dgr;fH°=−90.0±0.5 kJ⋅mol−1, &Dgr;fG°=−90.53±1.0 kJ⋅mol−1,S°=−101.6±3.7 J⋅mol−1⋅K−1for Fe2+(ao) and &Dgr;fH°=−49.0±1.5 kJ⋅mol−1, &Dgr;fG°=−16.28±1.1 kJ⋅mol−1,S° =−278.4±7.7 J⋅mol−1⋅K−1for 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 thermochemical property 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 ofp°=1 atm. A computer based reaction catalog of measurements accompanies the text analysis. ©1995 American Institute of Physics and American Chemical Society.

ISSN:0047-2689    

DOI:10.1063/1.555964

出版商:AIP    

年代:1995

数据来源: AIP