Tables of thermodynamic properties

In nrany instances tlrenrrodyiramic properties are reported iir tables. The advantage is tlrat data can be presented more precisely tlrair iir diagrams, but tire need for interpolation is introduced. 

Of tlie two kinds of data needed for evaluation of thermodynamic properties, heat capacities and PVT data, tire latter are most frequently missing. Foitunately, the generalized methods developed in Sec. 3.6 for tire coirrpressibility factor are also applicable to residual properties. Equations (6.47) and are put into generalized fomr by substitutionof the relation- 

The tenrrs oir the right sides of these equatioirs depend only on the upper limit P of the integrals aird oir the reduced teirrperature at which they are evaluated. Thus, values of H / 7 and S /R 

As with the generalized compressibility-factor correlation, tire complexity of tire fuirc-tioirs (H f/RTc, (H f/RTc, S f/R, and (Sy/R precludes tlreir geireral representation by simple equations. However, tire generalized secoird-virial-coefficientcorrelationvalid at low pressures fonrrs the basis for airalytical correlations of tire residual properties. The equation relating B to the functions aird 5 is derived iir Sec. 3.6  

Since B, B , and B are functions of temperature only, differentiation with respect to gives  

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IV. Appendix Tables of Thermodynamic Properties for Some Chlorine Oxyfluorides. ... 

In addition to a discussion of the individual compounds, a section was added correlating the physical and chemical properties of the chlorine oxyfluorides with their structure. In the Appendix, full tables of thermodynamic properties are given for each compound, where known. 

Natl. Bur. Standards, Tables of Thermodynamic Properties of Ammonia, Circ. 142... 

Reaction enthalpies also may be obtained from enthalpies of formation (AHjj, given in tables of thermodynamic properties [2, 3] ... 

These results may be tabulated along with the corresponding conditions of T and P existing at section 2 for a large number of runs. In addition, specific-volume measurements may be made for these same conditions, and these may be tabulated. Corresponding values of the internal energy of water may be calculated by Eq. (2.6), U = H - PV, and these numbers too may be tabulated. In this way tables of thermodynamic properties may be compiled over the entire useful range of conditions. The most widely used such tabulation is for H20 and is known as the steam tables, t... 

Thermodynamic properties were reviewed by Angus et al. (1976) and tables of thermodynamic properties were constructed. Vukalovich and Altunin (1968) reviewed both the thermodynamic and transport properties. These are similar to the Steam Tables (Haar et al., 1984), which should be familiar to most engineers. The latest tables for the thermodynamic properties of C02 are those of Span and Wagner (1996). 

If gases are at conditions at which they are far from ideal or if they undergo large pressure changes, you must either use tables of thermodynamic properties (such as the steam tables for water) or thermodynamic correlations beyond the scope of this text to determine AC. or AH. 

Appendix 3 A table of thermodynamic properties for common chemical species in aquatic systems. 

Because of the complexities of the equilibria involved in biochemical reactions Alberty and others and a Panel on Biochemical Thermodynamics have suggested that tables of thermodynamic properties for biochemical use be tabulated for the following conditions T = 298.15 K, P = 1 bar (0.1 MP = 0.987 atm), pH = 7, pMg = 3 ([Mg +] = 10 M), and ionic strength I (p in this chapter) = 0.25 M. There appears to be both advantages and disadvantages to this. The proponents suggest that the symbols AG, K , etc. be used for this... 

Ideal-gas tables of thermodynamic properties derived from statistical mechanics are based on the thermodynamic temperatures (as well as on the values of the physical constants used) and are hence independent of any practical temperature scale. The enthalpy of formation, Gibbs energy of formation, and logarithm of the equilibrium constant might depend on temperature-adjusted data. 

Despite these known deviations we have chosen to present the classical (Boltzmann) values here since the primary purpose of this table is to serve as a reference state for the calculation of tables of thermodynamic properties for atomic and molecular ions. When ionization equilibria are considered, the density (or partial pressure) of the electron gas will be extremely low except at very high temperatures. At an electron partial pressure of lO" bar, the deviation between classical and quantum... 

At higher concentrations of dissolved As(lll), polymeric species may form in solution and the implications from their formation must be understood. A particular equilibrium constant for an aqueous reaction will depend on what species, or what other reactions, are presumed to exist in the solution. It sometimes happens that tables of thermodynamic properties may have been generated by averaging equilibrium constants for a particular reaction or by averaging other thermodynamic properties derived therefrom. In some instances, appropriate attention had not been given to the fact that... 

The website mentioned above allows users to generate their own tables of thermodynamic properties. The user can select the units as well as the temperatures and/or pressures for which properties are to be generated. The results can be then be copied into spreadsheets or other files. 

Setzmann U, Wagner W. A new equation of state and tables of thermodynamic properties for methane covering the range from the melting line to 625 K at pressures up to 1000 MPa. J Phys Chem Ref Data 1991 20 1061. 

Adjustments must be made in the tables of thermodynamic properties to account for new, or better data, while maintaining the overall unity and consistency of these tables. For example, from the NBS Tech. Note 270-series, Selected Values of Thermodynamic Properties,1 a AG° of solution of CaS04 2H20(c) of 5.96 kcal.mol-1 is obtained. This leads to a solubility constant, Ks°, of 4.3 x 10 5 (from equation 3). More recent data indicate a value of AG° = 6.25 kcal mol-1, which results in a K ° = 2.63... 

We start by plotting the cycle on the temperature-entropy diagram for steam (Fig, 3.3-Ib. repeated below). Then we construct the table of thermodynamic properties (which follows) for each point in the cycle using the known operating conditions and the path from each point in the cycle to the next point. Based on this information, we can then compute the efficiency of the cycle... 

Most tables of thermodynamic properties for OHaq use the convention that values for H+aq are identically zero. Values from such tables were modified in obvious ways to obtain the entries for OH aq in Table I. 

Setzmann, U. and Wagner, W, A New Equation of State and Tables of Thermodynamic Properties for Methane Covering the Range from the Melting Line to 625 K at Pressures up to 1000 MPa, /. Phys. Chem. Ref. Data, 20, 1061,1991,... 

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