At a certain temperature and a total pressure of `10^(5) Pa`, iodine vapour contains `40%` by volume of `I "atoms"`, Calculate `K_(p)` for the equilibrium.
`I_(2(g))hArr2I_((g))`

Explanation

Given: Total pressure of `10^(5)"Pa,"` iodine vapour contain `40%` by volume of iodine atoms.
Asked: ` K_(P)=?`
Substitution & Calculation:
Partial pressure of "I" atoms
`(P_(1))=(40)/(100)xx10^(5)Pa=0.4xx10^(5)Pa`
Partial pressure of
`(P_(12))=(60)/(100)xx10^(5)Pa=0.60xx10^(5)Pa`
`K_(P)=(P_(1)^(2))/(P_(1//2))=(0.4xx10^5)^(2)/(0.60xx10^(5))=2.67xx10^(7)Pa`