Example 9.3-3 Prediction of the thermal conductivity of a gas mixture at 1 atm and 293K.
Using  mixkt
Here are your compounds' formulae and names:
No. Formula Name
----------------------------------------
1 CO2 carbon dioxide
2 O2 oxygen
3 N2 nitrogen
----------------------------------------
>>mixkt([.133 .039 .828],293)
ans =
0.0231
>  restart;
>  k:=.0231*W/m/K;
>  m:=100*cm;W:=0.23901*cal/s;
>  k; The text got 584e-7cal/cm/s/K