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

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

A

only (i) is are correct

B

Only (ii) is correct

C

both (ii) and (iii) are correct

D

both (i) and (ii) are correct

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