An open vessel containing air is heated form `300 K` to `400 K`. The fraction of air originally present which goes out of it is at `400 K`

Options

A. `3//4`
B. `1//4`
C. `2//3`
D. `1//8`

Explanation

One heating the gas in open vessel
AT `300 K , P_(1) V_(1) = n_(1) R 300`
At `400 K, P_(1) V_(1) =n_(2) R 400`
`(n_(1))/(n_(2)) = (400)/(300)`
`n_(2) = (3)/(4) n_(1)`
Thus `(1)/(4) n_(1)` gas is given out .