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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.
Components in Dry Air. The two most dominant components in dry air are Oxygen and Nitrogen. Oxygen has a 16 atomic unit mass and Nitrogen has a 14 atomic units mass. Since both of these elements are diatomic in air-O2 and N2, the molecular mass of Oxygen is 32 and the molecular mass of Nitrogen is 28. Air is a mixture of gases and the total mass can be estimated by adding the weight of all major components as shown below: