Propiedades De Gases y Liquidos

APPENDIX A

PROPERTY DATA BANK

This appendix contains selected property values; many of these have been used to compare the methods of the text. It is limited to those pure substances for which an experimentally validated critical temperature is listed in the Thermodynamics Research Center (TRC) data bank, College Station, TX, USA, or in the other reliable sources listed below. The valueshave been published with permission of TRC. Not all properties are experimentally available for all substances listed, but some estimates have been made with the methods described in the main body. The Formula listing for the substances has the atoms in alphabetical order except H follows C; the table has the species’ formula in alphabetical order. The Name used is from the IUPAC as given by TRC,although we have also given common names for some substances. Our symbols, fonts and equations are given below. The standard-state Gibbs energy and enthalpy of formation are for the species as an ideal gas at 298.15 K and 1.01325 bar (1 atmosphere). The reference states for the elements are as follows: Ideal gases at 298.15 K and 1.01325 bar: Ar, Cl2, D2, F2, He, H2, Kr, Ne, O2, Rn, T2, Xe.Crystalline solid at 298.15 K and 1.01325 bar: Al, As, B, C, I2, P, S, Se, Si, Ti, U Saturated Liquid at 298.15 K: Br2, Hg The table headings are as follows: Section All All All All A A A A A A A Column Heading No. Formula Name CAS# Mol. Wt. Tfp Tb Tc Pc Vc Zc Definition Number for this data base alphabetical listing of atoms in molecule, except H follows C IUPAC name (common name) Chemical AbstractsRegistry Number molecular weight, g mol 1 atmospheric (normal) freezing / melting point, K atmospheric (1.01325 bar) boiling point, K vapor / liquid critical temperature, K vapor / liquid critical pressure, bar vapor / liquid critical volume, cm3 mol 1 vapor / liquid critical compressibility factor Pc*Vc / (R*Tc)
A.1
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A.2

APPENDIX A

Section A B B B B B B B C

Column Heading Omega DelHf0 DelGf0 DelHb DelHm V liq T liq Dipole T range

Definition Pitzer acentric factor log10 (Pvp / Pc)T / Tc 0.7 1 (see Chap. 2) standard state enthalpy of formation (see Chap. 3), kJ mol 1 standard state Gibbs energy of formation (see Chap. 3), kJ mol 1 enthalpy change of atmospheric boiling,kJ mol 1 (see Chap. 7) enthalpy change of atmospheric melting, kJ mol 1 liquid molar volume, cm3 mol 1, at T liq temperature for V liq, K molecular dipole moment, debye, 3.162 10 25(J m3)1 / 2 (see Chap. 2) range of temperatures for which ideal gas heat capacity at constant pressure (C p) data were fitted by TRC to polynomial C p / R a0 a1*T a2*T2 a3*T3 a4*T4 with T in K. The value of C p isobtained by multiplying the result of the above equation by a value of the universal gas constant, R, and it will have the same units as the R used (see Table 2-1). Values at any temperature outside of T range are expected to be erroneous. parameters for TRC polynomial equation for C p / R. TRC tabulated values for C p at T 298.15 K or calculated from the polynomial where R has been taken as 8.3143 Jmol 1 K 1 TRC or other tabulated values for Cp of the liquid at T 298.15 K; J mol 1 K 1 number of equation for calculating pure vapor pressure, Pvp, bar (see Chap. 7) log10(Pvp) A B / (T C 273.15) log10(Pvp) A B / (T C 273.15) 0.43429xn E*x8 F*x12 where x (T to 273.15) / Tc ln(Pvp) ln(Pc) (Tc / T)*(a*tau b*tau1.5 c*tau2.5 d*tau5) where tau (1 T / Tc) Note: for water only the last two terms arec*tau3 d*tau6 parameters in Pvp Equations #1, #2, and #3. Usually A, B, C for Equation #1 are the same as those for Equation #2. Note that since Tc is a correlating parameter here, the values may differ from those in Section A.

C C

a0; a1; a2; a3; a4 CpIG

C D

Cpliq Equation # Equation #1: Equation #2: Equation #3:

D

A / A / Tc; B / B / a; C / C / b; Tc / c; to / d; n / Pc; E; F...