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My first attempt to thermal split CO2 in cells, and return new values of CO2, O2, and CO. Also the remaining energy per a cell (consumed due to CO2 splitting). ANY recommendations, advise please? Ignore values of temperature and energy for now.

#include "udf.h"
DEFINE_PROPERTY(cell_CO2_split, cell, thread)
{
/*program to handle CO2 thermal splitting, assumed figures for now*/
/* define CO2, CO, and O2 as real, and they must be in mol values */
real CO2;
real CO;
real O2;
/* define temperature in cell and get its value */
real temp = C_T(cell, thread);
/*
define as real the ‘energy_IN_cell_per_mol_wt’. This needs to be obtained as energy in J/mol per a cell. Divided by the mol weight value. For CO2.*/
dzdt>energy=dh_dt; /*gas phase enthalpy J/s.*/
dzdt>energy=new_dh_dt;
dzdt>species[CO2=gas_mass_cell]; /*gas phase species mass kg/s*/
energy_IN_cell_per_mol_wt=dh_dt/gas_mass_cell;
real energy_IN_cell_per_mol_wt = C_E(cell,thread);
if (temp ≥ 500 && < 1000)
if (energy_IN_cell_per_mol_wt ≥(100e3/0.044) && <(150e3/0.044));
/*Above division by 0.044 gives energy per a cell per molar weight of CO2. Where 0.044 is the molar weight of CO2.*/
CO=1;
O2=1;
CO2=0;
/*
Below; energy taken (125e3) to split CO2, must be subtracted from cell. Then new value returned
*/
new_dh_dt=(dh_dt) - 125e3; /*subtract energy taken by CO2 per a cell.*/
return CO;
return O2;
return CO2;
return new_dh_dt;
endif;
else
CO2=1.;
return CO2;
}