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The cross second virial coefficient and three dilute gas transport properties (shear viscosity, thermal conductivity, and binary diffusion coefficient) of mixtures of hydrogen sulfide (H 2 S) and nitrogen (N 2 ) were determined with high accuracy at temperatures up to 1200 K using statistical thermodynamics and the kinetic theory of molecular gases, respectively. The required intermolecular potential energy surface (PES) for the H 2 S–N 2  interaction is presented in this work, while the H 2 S–H 2 S and N 2 –N 2  PESs were reported previously. All three PESs are based on high-level quantum-chemical  ab initio  (i.e. first-principles) calculations. There is only very limited experimental information available on the second virial coefficients of H 2 S–N 2  mixtures, and there appear to be no experimental data at all for the transport properties. Thus, the present predictions constitute a substantial increase in our knowledge of the thermophysical properties of this system, which are of practical relevance for modeling sour natural gas.

Thermophysical Properties of Gaseous H 2 S–N 2 Mixtures from First-Principles Calculations