CKGBMS    CKGBMS    CKGBMS    CKGBMS    CKGBMS    CKGBMS    CKGBMS    
          **********************************************
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                              ******

SUBROUTINE CKGBMS (P, T, Y, ICKWRK, RCKWRK, GBMS)
Returns the mean Gibbs free energy of the mixture in mass units
given pressure, temperature(s), and mass fractions.

INPUT
P         - Real scalar, pressure.
               cgs units, dynes/cm**2
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
Y(*)      - Real array, mass 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
GBMS      - Real scalar, mean Gibbs free energy.
               cgs units, ergs/gm