According to the Avogadro's law , equal ...

According to the Avogadro's law , equal number of moles of gases occupy the same volume at identical conditions of temperature and pressure. Even if we have a mixture of non-reacting gases then Avogadro's law is still obeyed by assuming mixture as a new gas.
Now let us assume air to consist of 80% by volume of nitrogen `(N_(2))` and 20% by volume of oxygen `(O_(2))` . If air is taken at STP , then its 1 mol would occupy 22.4 L . 1 mol of air would contain 0.8 mol of `N_(2)` and 0.2 mol of `O_(2)` hence the mole fraction of `N_(2)` and `O_(2)` are given by `X_(n_(2))=0.8, X_(o_(2))=0.2`
Density of air at STP is:

1 g/L

`(9)/(7) g//L`

`(2)/(7)g//L`

can't be determined

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According to the Avogadro's law , equal number of moles of gases occupy the same volume at identical conditions of temperature and pressure. Even if we have a mixture of non-reacting gases then Avogadro's law is still obeyed by assuming mixture as a new gas. Now let us assume air to consist of 80% by volume of nitrogen (N_(2)) and 20% by volume of oxygen (O_(2)) . If air is taken at STP , then its 1 mol would occupy 22.4 L . 1 mol of air would contain 0.8 mol of N_(2) and 0.2 mol of O_(2) hence the mole fraction of N_(2) and O_(2) are given by X_(n_(2))=0.8, X_(o_(2))=0.2 Volume occupied by air at STP containing exactly 11.2 gm f nitrogen:

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GRB PUBLICATION-MOLE CONCEPT, STOICHIOMETRY & CONCENTRATION TERMS-Comprehension#45

According to the Avogadro's law , equal number of moles of gases occup...
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