1.

Air contains `N_(2)` and `O_(2)` in the ratio of 4:1 by volume. The average conditions of temperature and pressure ?A. `12.0`B. `14.4`C. `15.6`D. `28.8`

Answer» Correct Answer - B
As under similar conditions of temperature and pressure, equal volumes contain equal number of moles , therefore, molar ratio of `N_(2)=4//5=0.8` and mol fraction of `O_(2)=0.2`
`:.` Average vapour density of air `=(28.8)/(2)=14.4`


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