Standard transformed enthalpy of formation

This equation reproduces the second column of Table 3.1 to 0.1% accuracy. The coefficient RT2(da/dT)P in the equation for the standard transformed enthalpy of formation of a species is given by... 

Substituting equation 3.6-3 yields the standard transformed enthalpy of formation... 

The standard transformed enthalpy of formation of the pseudoisomer group is a... 

The Vj are the stoichiometric numbers of reactants in the biochemical equation (positive for reactants on the right side of the equation and negative for reactants on the left side). The prime is needed on the stoichiometric numbers to distinguish them from the stoichiomeric numbers in the underlying chemical reactions. The standard transformed enthalpy of reaction Ar H(heat of reaction) is related to the standard transformed enthalpies of formation Af //,of the reactants by... 

Calculation of the functions of pH and ionic strength for the standard transformed enthalpies of formation of reactants... 

The following is a list of functions for the reactants with which the standard transformed enthalpies of formation can be calculated. It is shorter than the list of reactants for the transformed Gibbs energies because these is less information about standard enthalpies of formation of species. 

Table 3 Standard Transformed Enthalpies of Formation (in kJ mol-1) of Biochemical Reactants at pH 7 and Ionic Strengths of 0, 0.10, and 0.25 M.

Note that the standard transformed Gibbs energy of formation of a species depends on the pH, but the standard transformed enthalpy of formation does not. When species have electric charges, their standard thermodynamic properties need to be adjusted for the ionic strength according to the extended Debye-Huckel theory (see Section 1.3) At zero ionic strength,... 

In order to calculate the standard transformed enthalpy of formation of inorganic phosphate under these conditions we need to calculate the equilibrium mole fractions of the two species using equation 3.5-6. 

Table 3.2 Standard transformed enthalpies of formation in kJ moF of inorganic phosphate at 298.15 K.

Table 4.2 Standard transformed enthalpies of formation of inorganic phosphate in kJ mol" at three temperatures, five pHs, and three ionic strengths...

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