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Question:
What is the weight of air?



Replies:
Air is composed of about 80% nitrogen (molecular weight is 28 g/mole) and about 20 % oxygen (molecular weight is 32 g/mole). The approximate weight of air is then (0.8 * 28) + (0.2 * 32) = 28.8 g/mole. One mole of a gas at standard temperature and pressure (0 degrees and 1 atmosphere) occupies about 22.4 liters. Thus air weighs about 1.3 grams per liter.

Greg



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