The results of photosynthesis are used by cellular respiration, and photosynthesis first uses the results of cellular respiration.
In the mitochondria, cellular respiration combines oxygen and glucose to produce ATP, along with water and carbon dioxide. Sunlight energy is used during photosynthesis to create glucose and separate oxygen from carbon dioxide and water. Globally, the exchange of carbon dioxide and oxygen during photosynthesis or cellular respiration serves to maintain stable levels of oxygen and carbon dioxide in the atmosphere.
Cellular Respiration: [tex]C_6H_1_2O_6+ 6O_2[/tex] → [tex]6CO_2 + 6H_2O[/tex]
Because CO₂ and H₂O are less energetic than the reactants, most notably glucose, the reaction is exothermic and has a negative enthalpy (ΔH < 0). This also makes sense because breathing causes glucose to be converted to energy.
Photosynthesis: [tex]6CO_2 + 6H_2O[/tex]→ [tex]C_6H_1_2O_6+ 6O_2[/tex]
The enthalpy change for the photosynthesis reaction is +2814 kJ/mol.
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