If a mixture of `3` moles of `H_(2)` and one mole of `N_(2)` is completely converted into `NH_(3)`. What would be the ratio of the initial and final volume at same temperature and pressure ?

Explanation

`{:(,,N_(2),+,3H_(2),hArr,2NH_(3)),(,"Initial mole",1,,3,,0),(,"Final mole",0,,0,,2):}`
(`:'` Complete conversion)
Ratio of initial and final volumes`=("initial moles")/("final moles")`
(`:' V prop n` if `P` and `T` are constant) `=(4)/(2)=2`