CKDHXP    CKDHXP    CKDHXP    CKDHXP    CKDHXP    CKDHXP    CKDHXP    
          **********************************************
                    **************************
                              ******

SUBROUTINE CKDHXP (P, T, X, ICKWRK, RCKWRK, HDOT)
Returns the heat release rate of the mixture
given pressure, temperature(s) and mole 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
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
HDOT      - Real scalar, heat release rate of the mixture.
               cgs units, ergs/s/cm**3