`2 "mole"` of `PCl_(5)` were heated in a closed vessel of `2 litre` capacity. At equilibrium `40%` of `PCl_(5)` dissociated into `PCl_(3)` and `Cl_(2)`. The value of the equilibrium constant is:

Options

A. 0.25 lit/mole
B. 1.31 lit/mole
C. 0.76 lit/mole
D. 2.6 lit/mole

Answer

C

Explanation

`PCl_(3)+Cl_(2) Leftrightarrow PCl_(5)`
`"Initial",1,2,0`
Reacted & formed at equilibrium `1-x " "2-xx(x=0.3)`
`K_(c)=[(0.3)/(3)] xx [3/(1.7)] xx (3)/(0.7)`