N2 → NH3 → NO → NO2 →HNO3 →NH4NO3

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This is the process of the nitrogen cycle, which involves the conversion of nitrogen gas (N2) into various forms that are utilized by plants for growth.

N2 (nitrogen gas) is converted into NH3 (ammonia) through a process called nitrogen fixation, which can be carried out by certain bacteria in the soil or through industrial processes like the Haber-Bosch process.

NH3 (ammonia) can then be converted into NO (nitric oxide) through a process called nitrification, which is mediated by nitrifying bacteria in the soil.

NO (nitric oxide) is further oxidized to NO2 (nitrogen dioxide) by other bacteria in the soil.

NO2 (nitrogen dioxide) can then react with water to form HNO3 (nitric acid), which can contribute to acid rain.

Finally, HNO3 (nitric acid) can react with NH3 (ammonia) to form NH4NO3 (ammonium nitrate), a soluble form of nitrogen that can be easily absorbed by plants.

Overall, this process helps to recycle nitrogen in the environment and provides essential nutrients for plant growth.