The relative molecular mass of ammonia (NH3) is calculated by adding the atomic masses of its constituent atoms. Ammonia consists of one nitrogen atom and three hydrogen atoms.
The atomic mass of nitrogen (N) is approximately 14 atomic mass units (amu), and the atomic mass of hydrogen (H) is approximately 1 amu. Therefore, the relative molecular mass of ammonia can be calculated as follows:
Relative Molecular Mass of NH3 = (1 × 14) + (3 × 1) = 14 + 3 = 17 amu
Thus, the relative molecular mass of ammonia is 17 amu.