When thermochemical data are quoted, often the units are #DeltaH*mol^-1#. In the photosynthesis reaction, why is #DeltaH_"rxn"^@=2800*kJ*mol^-1#?
This is a good question. Thermodynamic data are quoted per mole of REACTION as WRITTEN.
You have grasped why this reaction is endothermic. It is a bond breaking reaction, that requires the cleavage of strong
Note that it is not only carbon dioxide cleavage that requires this energy; the reaction requires the breaking of strong
When we do the reverse reaction, i.e. the combustion reaction, conservation of energy requires that for,
i.e. a molar quantity of glucose gives this energy on combustion (by formation of 6 molar quantities of carbon dioxide and water).
Of course, I am just writing this fact down here. But I can assure you that this combustion reaction has been experimentally measured ad infinitum, and