MCACON    MCACON    MCACON    MCACON    MCACON    MCACON    MCACON    
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                              ******

SUBROUTINE MCACON (T, X, RMCWRK, CONMIX)
Returns the mixture thermal conductivity given temperature and
species mole fractions.

INPUT
T         - Real scalar, temperature.
               cgs units, K
X(*)      - Real array, mole fractions of the mixture;
            dimension at least KK, the total species count.
RMCWRK(*) - Real workspace array; dimension at least LENRMC.

OUTPUT
CONMIX    - Real scalar, mixture thermal conductivity.
               cgs units, erg/cm*K*s