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What is the density of a gas at N.T.P. i...

What is the density of a gas at N.T.P. if the rms velocity of the gas molecules is `400 m//s`? (Take atmospheric pressure P= `1 xx 10^5 N//m^2`)

A

`5/8kg//m^3`

B

`11/8kg//m^3`

C

`15/8kg//m^3`

D

`25/8kg//m^2`

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