This paper uses results from statistical-mechanical theory, applied through a combination of an extended principle of corresponding states, with some knowledge of intermolecular potentials, to the calculation of the transport and eqUilibrium properties of gas mixtures at low density. The gases involved are: N 2 , °2, NO, CO, CO 2 , N 2 0, CH 4 , CF 4 , SF 6 , C 2 H 4 , C 2 H 6 , and He, Ar, Ne, Kr, Xe. The properties included are: second virial coefficient, viscosity, diffusion, and thermal diffusion, but not thermal conductivity. The calculations are internally, therinodynamically consistent and the resulting algorithms, which are fully programmable, operate in an entirely predictive mode by means of validated combination rules. This paper is a sequel to one on the five noble gases and all their possible mixtures and a second on the above eleven polyatomic gases. The paper contains ten tables (mainly intended for the checking of computer codes) and 20 I graphs of deviation and comparison plots. An additional 98 tables have been deposited with the Physics Auxiliary Publication Service (PAPS) of the AlP. The algorithms presented in this paper, together with those mentioned above, make it possible to program calculations for a wide range oflow-density equilibrium and transport properties of 16 gases and of all possible multicomponent mixtures formed with them, for a total of 65,535 systems. For each system, the program would cover the full range of compositions.

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We present a complete ~et of easily programmable computer algorithms, and a set of numerical tables, for the thernial conductivities of the nine gases: N 2 , O 2 , NO, CO, CO 2 , N 2 0, CH 4 , CF 4 , and SF~. This complements our earlier correspondingstates work on the equilibrium and 'transport properties of these gases [J. Phys. Chern. Kef. Data 16, 445 (lYH7); 17, 255 (lYHH)]. The results embrace the temperature range from T* = kT / E = 1 up to a nominal upper limit of 3000 K. The accuracy achieved is specified, and the correlation can be used in a predictive mode_

Two recent works have shown that at small Knudsen number ͑K͒ the pressure and temperature profiles in plane Poiseuille flow exhibit a different qualitative behavior from the profiles obtained by the Navier-Stokes equations. Tij and Santos ͓J. Stat. Phys. 76, 1399 ͑1994͔͒ used the Bhatnagar-Gross-Kook model to show that the temperature profile is bimodal and the pressure profile is nonconstant. Malek-Mansour, Baras, and Garcia ͓Physica A 240, 255 ͑1997͔͒ qualitatively confirmed these predictions in computer experiments using the direct simulation Monte Carlo method ͑DSMC͒. In this paper we compare the DSMC measurements of hydrodynamic variables and non-equilibrium fluxes with numerical solutions of the Burnett equations. Given that they are in better agreement with molecular-dynamics simulations ͓E. Salomons and M. Mareschal, Phys. Rev. Lett. 69, 269 ͑1992͔͒ of strong shock waves than Navier-Stokes ͓F. J. Uribe, R. M. Velasco, and L. S. García-Colín, Phys. Rev. Lett. 81, 2044 ͑1998͔͒, and that they are second order in Knudsen number suggests that the Burnett equations may provide a better description for large K. We find that for plane Poiseuille flow the Burnett equations do not predict the bimodal temperature profile but do recover many of the other anomalous features ͑e.g., nonconstant pressure and nonzero parallel heat flux͒.