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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.
So any gas with a MW less than 29 will be lighter than air. That, by the way, includes nitrogen! Methane has a MW of 16; helium is 4; hydrogen is 2. I can't think of any other compound or element that's a gas at STP that has a MW less than 29. Afterthought: OK, neon has a molecular weight of 20, which is lighter than air. Ammonia (gas at room temp) has a MW of 17.