Chemosynthetic bacteria reduce CO₂ emissions by splitting H₂S rather than , as photosynthetic organisms do.
The reason for this is a change in free energy. Yes, the free energy change for splitting H₂O is +33 kJ/mol, while the free energy change for splitting H₂S is -33 kJ/mol. And, because the free energy is negative, the reaction for splitting H₂S is feasible. As a result, H₂S is preferred over H₂O water.
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