1.

At `473 K`, equilibrium constant `K_(c )` for decomposition of phosphorus pentachloride, `PCl_(5)` is `8.3xx10^(-3)`. If decomposition is depicted as, `PCl_(5)(g) hArr PCl_(3)(g)+Cl_(2)(g) Delta_(r)H^(Θ)=124.0 kJ mol^(-1)` a. Write an expression for `K_(c )` for the reaction. b. What is the value of `K_(c )` for the reverse reaction at the same temperature? c. What would be the effect on `K_(c )` if i. More `PCl_(5)` is added ii. Pressure is increased iii. The temperature is increased?

Answer» (a) The expression for `K_(c) = [[PCI_(3)(g)][CI_(2)(g)]]/[[PCI_(5)(g)]]`
(b) For reverse reaction `(K_(c)) = (PCI_(5)(g))/[[PCI_(3)(g)][CI_(2)(g)]] =(1)/(8.3 xx 10^(-3)) =120.48`
(c) (i) By adding more of `PCI_(5)` value of `K_(c)` wil remain constant because there is no change in temperature .
(ii) By increasing the temperature , the forward reaction will be favoured since it is endothermic in nature. Therefore , the value of equilibrium constant will increase.


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