At 473K, equilibrium constant `K_(c)` for decomposition of `PCl_(5)` is `8.3x10^(-3)`. If decomposition is depicted as, `PCl_(5)(g)hArr PCl_(3)(g)+Cl_(2)(g),`
`DeltaH_(r)^(0)=124.0kJ*mol^(-1)`
What would be the effect on `K_(c)` if (i) more `PCl_(5)` is added (ii) presure is increased (iii) the temperature is increased?

Explanation

(i), (ii) increasing concentration of `PCl_(5)` or increasing pressure has no effect on the value of `K_(c)`.
(iii) As the reaction is endothermic (`DeltaH` is +ve), the increase in temperature will increase the value of `K_(c)`.