The atomic mass of nitrogen is approximately 14.01 atomic mass units (amu). This value is an average that accounts for the natural abundance of its isotopes, primarily nitrogen-14 and nitrogen-15.
Nitrogen-14, which is the most abundant isotope, has 7 protons and 7 neutrons, resulting in an atomic mass of about 14 amu. Nitrogen-15, on the other hand, has 7 protons and 8 neutrons, with a slightly higher mass. The atomic mass you see, 14.01, reflects the slight contribution from nitrogen-15.
Understanding atomic mass is important in chemistry as it helps in calculating the molar mass of compounds that contain nitrogen, which is essential for stoichiometric calculations in chemical reactions.