The Total solution for NCERT class 6-12
At 473 K, equilibrium constant Kc for decomposition ofphosphorus pentachloride, PCl5 is 8.3 ×10-3. If decomposition isdepicted as,
ΔrH° = 124.0 kJmol–1
a) Write an expression for Kc for the reaction.
b) What is the value of Kc for the reversereaction at the same temperature?
(a)
(b) Value of Kc for the reversereaction at the same temperature is:
(c) (i) Kc would remain the samebecause in this case, the temperature remains the same.
(ii) Kc is constant at constanttemperature. Thus, in this case, Kc would not change.
(iii)In an endothermic reaction, the value of Kc increases with an increasein temperature. Since the given reaction in an endothermic reaction, the valueof Kc will increase if the temperature isincreased.