At certain temperature (T) for the gas phase reaction
2H
2
O(g) + 2Cl
2
(g) 4HCl(g) + O
2
(g) K
p
= 12 × 10
8
atm
If Cl
2
, HCl & O
2
are mixed in such a manner that the partial pressure of each is 2 atm and the mixture is
brough into contact with excess of liquid water. What would be approximate partial pressure of Cl
2
when equilibrium is attained at temperature (T)?
[Given : Vapour pressure of water is 380 mm Hg at temperature (T)]