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  • Jan 16, 2010, 12:20 AM
    hansi bhakuni
    Molecular weight of air
    How to calculate molecular weight of air
  • Jan 16, 2010, 12:35 AM
    Unknown008

    Well, all you can do is approximate it.

    What is the composition of air?
    Nitrogen gas 78%
    Oxygen 21%

    An approximate molecular weight would be the average of those two gases which are the most abundant.

    78% is of mass 28 g
    21% is of mass 32 g.

    100% would have approximately

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