The present work is concerned with extracting information about intermolecular potential energies of binary mixtures of CO

2

with C

2

H

6

C

3

H

8

n-C

4

H

10

and iso-C

4

H

10

by the usage of the inversion method

and then predicting the dilute gas transport properties of the mixtures. Using the inverted pair potential energies

the Chapman-Enskog version of the kinetic theory was applied to calculate transport properties

except thermal conductivity of mixtures. The calculation of thermal conductivity through the methods of Schreiber et al. and Uribe et al. was discussed. Calculations were performed over a wide temperature range and equimolar composition. Rather accurate correlations for the viscosity coefficients of the mixtures in the temperature range were reproduced from the present unlike intermolecular potential energies. Our estimated accuracies for the viscosity are within ?2%. Acceptable agreement between the predicted values of the viscosity and thermal conductivity with the literature values demonstrates the predictive power of the inversion scheme. In the case of thermal conductivity our results are in favor

of the preference of Uribe et al.'s method over Schreiber et al.'s scheme.