To determine the relative atomic mass of nitrogen present in a molecule of ammonia (NH₃), we need to consider the atomic masses of nitrogen and hydrogen and their respective ratios in the ammonia molecule.
The atomic mass of nitrogen (N) is approximately 14.01 atomic mass units (amu), while the atomic mass of hydrogen (H) is approximately 1.008 amu. The ammonia molecule (NH₃) consists of one nitrogen atom and three hydrogen atoms.
To calculate the relative atomic mass of nitrogen in ammonia, we can use the following formula:
Relative atomic mass of nitrogen in NH₃ = (Number of nitrogen atoms × atomic mass of nitrogen) / (Total number of atoms in NH₃)
In this case, the number of nitrogen atoms in ammonia is 1, and the total number of atoms in NH₃ is 4 (1 nitrogen atom + 3 hydrogen atoms).
Relative atomic mass of nitrogen in NH₃ = (1 × 14.01 amu) / 4 = 3.5025 amu
Therefore, the relative atomic mass of nitrogen present in a molecule of ammonia (NH₃) is approximately 3.5025 atomic mass units.