1 litre capacity flask containing `NH_(3)` at 1 atm and `25^(@)C` A spark is passed through until all the `Nh_(3)` is decomposed into `N_(2)` and `H_(2)` Calculate the prssure of gases left at `25^(@)C` .

Answer

2

Explanation

`2NH_(3) rarr N_(2)+3H_(2)`
At same `P` and `T`
Number of moles after reaction `(n_(2))`
`=2xx` unmber of moles before reaction `(n_(1))`
`:. P propn`
`:. (P_(1))/(P_(2)) = (n_(1))/(n_(2)) = (1)/(2)`
Pressure after reaction `=2atm` .