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To answer the question, pure ammonia has a density of ~0.7-0.9 g/L, depending on temperature. The density of air is ~1.2 g/L, again depending on temperature and pressure. So, yes, ammonia gas is lighter than air in terms of density. 3 people found this useful.
Atom for atom, nitrogen is lighter than oxygen. Nitrogen has an atomic weight of just over 14, while oxygen has an atomic weight of almost 16. An admixture of oxygen and nitrogen should be heavier than nitrogen alone. Atomic weight is not the final determinant; however, as the term heavier than air is usually taken to mean more dense.. If nitrogen has a higher density than oxygen, it should sink in the presence of oxygen regardless of its atomic or molecular mass.