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What is the density of air at STP? Assum...

What is the density of air at STP? Assume that air contains 78% `N_(2) and 22%` `O_(2)` by masses.

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Average molar mass of air
`=(28xx78+32xx22)/(100)=28.88g*mol^(-1)`
`d=(PM)/(RT)=(1xx28.88)/(0.0821xx273)g*L^(-1)=1.288g*L^(-1)`
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  14. At constant temperature 2L of N(2) gas at 750 mm Hg pressure I mixed w...

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