How to calculate the volume of air in a compressed container?

How to calculate the volume of air in a compressed container?
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Answer :

answer:This is one of the handiest rules of thumb to know.: 22.4 liters of gas at STP (Standand Temperature and Pressure weighs it’s molecular weight in grams. For example 22.4 liters of Oxygen weighs 32 grams 22.4 liters of helium weighs 2 grams. 22.4 liters of Nitrogen weights 28 grams. You have 14 oz ,call it 400 grams of (assume) propane C3H8 ( MW 44) is 22.4 x 400/44 = ~200 liters.
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