Question

why is nitrogen produced in the air denser than the nitrogen produced in the laboratory

Answer 1

Answer:

heavier than chemical nitrogen, largely because “chemical nitrogen” is ultimately derived from atmospheric nitrogen. On the other hand, you could be asking why the atomic mass of nitrogen is not the same as the mass of nitrogen gas; that's because gaseous nitrogen is diatomic .

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Answer 2

Nitrogen (N2) is diatomic as when monotonic it's very unstable. There are two isotopes of nitrogen: Nitrogen-14 (which has 7 electrons, 7 protons, and 7 neutrons ) and Nitrogen-15 (which has 7 electrons, 7 protons, and 8 neutrons). So Nitrogen-15 is heavier than Nitrogen-14.

Differenciating from the one produced as a result of a chemical reaction, aerial nitrogen, aerial nitrogen has a higher natural abundance of Nitrogen-15 isotopes, while the one produced in the lab is mainly Nitrogen-14 isotope, the most common one.