The Total solution for NCERT class 6-12
At 473 K, equilibrium constant┬аKc┬аfor decomposition ofphosphorus pentachloride, PCl5┬аis 8.3 ├Ч10-3. If decomposition isdepicted as,
╬ФrH┬░ = 124.0 kJmolтАУ1
a) Write an expression for┬аKc┬аfor the reaction.
b) What is the value of┬аKc┬аfor the reversereaction at the same temperature?
(a)┬а
(b)┬аValue of┬аKc┬аfor the reversereaction at the same temperature is:
(c)┬а(i)┬аKc┬аwould remain the samebecause in this case, the temperature remains the same.
(ii)┬аKc┬аis constant at constanttemperature. Thus, in this case,┬аKc┬аwould not change.
(iii)In an endothermic reaction, the value of┬аKc┬аincreases with an increasein temperature. Since the given reaction in an endothermic reaction, the valueof┬аKc┬аwill increase if the temperature isincreased.