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Density of dry air containing ony N2 and...

Density of dry air containing ony `N_2 and O_2` is `1.15 g/L` at `740 mm ` of `Hg and 300 K`. What is % composition of `N_2` by mass in the air ?

A

`78%`

B

`85.5%`

C

`70.02%`

D

`62.75%`

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