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if the components of air are N2-78% ;O2-21%; Ar-0.9% and Co2-0.1% by volume (or mole) what would be the molecular weight of air?

  • chemistry -

    just plug in the mol wts of the compounds in

    0.78*N2 + 0.21*O2 + 0.009*Ar * 0.001*CO2

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