Compare the molar masses of ammonia and air. How many times is ammonia lighter than air?

Compare the molar masses of ammonia and air. How many times is ammonia lighter than air? How should the ammonia collection tube be positioned?

M (NH3) = 17g / mol
M (air) = 29g / mol
Since the molecular weight of ammonia is less than the molecular weight of air, ammonia is lighter than air by 29/17 = 1.7 times.
Because Since ammonia is lighter than air, the tube should be kept upside down to collect it.

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