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Amospheric air has 78% N(2): 21% O(2): 0...

Amospheric air has 78% `N_(2)`: 21% `O_(2)`: 0.9% Ar and 0.1% `CO_(2)` by volume. What is the molecular mass air in the atmosphere?

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Molecular mass of mixture
`=(sum %"of each")/(100)xx"Molar mass"`
`=(78)/(100)xx28+(21)/(100)xx32+(0.9)/(100)xx40+(0.1)/(100)=28.-964`
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