Both reactions are accompanied by the release of energy – exothermic reactions. The amount of energy released during the oxidation of the hydrogen sulfide to sulfuric acid is equal to the sum of the energies released in each reaction. So the energy effect of the reaction of oxidation of hydrogen sulfide to sulfuric acid is 908 kJ.
Nitrifying bacteria are extremely widespread in soil and in various water bodies. They produce energy by oxidizing ammonia and nitrous acid, therefore they play a very important role in the nitrogen cycle in nature. Ammonia formed during the decay of proteins in soil or in water bodies. It is oxidized by nitrifying bacteria (Nitrosomonas).
Further oxidation of the formed nitrous acid is carried out by another group of nitrifying microorganisms – Nitrobacter – nitrobacter:
The energy effect of the reactions of the oxidation of ammonia to nitric acid is 763 kJ.
The nitrification process takes place in the soil on a large scale and serves as a source of nitrates for plants. Vital activity of bacteria is one of the most important factors in soil fertility.
The energy effect of hydrogen oxidation reactions is 235 kJ. Hydrogen bacteria oxidize hydrogen, which is constantly formed during anaerobic (oxygen-free) decomposition of various organic residues by soil microorganisms.
Chemosynthetic bacteria that oxidize iron and manganese compounds live in both fresh and marine bodies of water. Due to their life activity, a huge amount of deposited iron and manganese ores is formed at the bottom of marshes and seas. Academician V.I. Vernadsky, the founder of biogeochemistry, spoke of deposits of iron and manganese ores as a result of the activity of these bacteria in ancient geological periods.
The energy effect of the reactions of oxidation of iron (II) to iron (III) is 324 kJ.
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