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If average molecular mass of air is 29, ...

If average molecular mass of air is 29, then assuming `N_(2)` and `O_(2)` gases are there, which option are correct regarding composition of are?
(i) `75% "by mass of" N_(2)" "(ii) 75% "by moles "N_(2)" "(iii)72.41% "by mass of" N_(2)`

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