The material in this work is intended to serve as analyzing corresponding states correlation of viscosity in terms of pair interaction potential energy of Ar-H-2 gas mixture using inversion method. The inverted potential energy has been compared with the Buckingham-Corner (BC) and exp-6 models potential proposed by others. Our inverted model potential is in very good agreement with the BC model potential energy. Calculation of the transport properties at low density using the inverted pair interaction energy is discussed. A rather accurate correlation for the viscosity coefficients which embraces the temperature range 200 < T < 3273.15 is reproduced from the inverted intermolecular potential energy. Our estimated accuracies for the viscosities are within 2%. Also, the calculated potential energy is used to present smooth correlations for other transport properties. The accuracies are of the order 3% for the thermal conductivity coefficients, 5% for the binary diffusion coefficients, and 10% for the thermal diffusion factors. (c) 2005 Elsevier B.V All rights reserved.