Question

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))`

Answer 1

According to available data:
Total pressure of equilibrium mixture `=10^(5) Pa`
Partial pressure of iodine atoms `(I) =(40)/(100) xx (10^(5) Pa) =0.4 xx 10^(5)Pa`
Partial pressure iodine molecules `(I_(2)) =(60)/(100)xx(10^(5) Pa) =0.6 xx 10^(5) Pa`
`underset((0.6xx10^(5) Pa))(i_(2) (g)) hArr underset((0.4xx10^(5) Pa))(2I(g))`
`K_(p) =(pI^(2))/(pI^(2))= ((0.4 xx 10^(5)Pa)^(2))/((0.6xx10^(5) Pa)) =2.67 xx 10^(4) Pa`