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Hydrogen sulfide (H2S, 34g/mol) has a higher molar mass than ammonia (NH3, 17g/mol), so if equal volumes of both gases were released in the same physical area, you would be most likely to smell the ammonia first because it's lighter and would be carried along through the air more quickly by diffusion. Also, if both gases were in a balloon with a tiny hole in it, the ammonia would effuse out more quickly than the hydrogen sulfide, again, because of the lower molar mass.

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Q: Which is heavier NH3 or H2S Which one can be smell first?
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