CKXTCR    CKXTCR    CKXTCR    CKXTCR    CKXTCR    CKXTCR    CKXTCR    
          **********************************************
                    **************************
                              ******

SUBROUTINE CKXTCR (RHO, T, X, ICKWRK, RCKWRK, C)
Returns the molar concentrations given mass density, temperature(s),
and mole fractions.

INPUT
RHO       - Real scalar, mass density.
               cgs units, gm/cm**3
T(*)      - Real array, temperature(s); dimension is determined by
            the application program to be the total number of
            species temperatures, nominally 1.
               cgs units, K
X(*)      - Real array, mole fractions of the mixture;
            dimension at least KK, the total species count.
ICKWRK(*) - Integer workspace array; dimension at least LENICK.
RCKWRK(*) - Real    workspace array; dimension at least LENRCK.

OUTPUT
C(*)      - Real array, concentrations of the species;
            dimension at least KK, the total species count.
               cgs units, mole/cm**3