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Question

For the reaction
CuSO45H2O(s)CuSO43H2O(s)+2H2O(g)
which one is correct representation :-
(1) Kp=(P(H2O))2
(2) Kc=(H2O)2
(3) Kp=Kc(RT)2
(4) All

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Solution

The correct option 1.
Salt is one that loses water to the atmosphere. This will occur if the water vapour pressure in equilibrium with the salt is greater than the water vapour
the pressure in the atmosphere. The mechanism by which cuso4.5H2O could be efflorescent is that the salt would lose 2 molecules of water and simultaneously from 1 formula unit of cuso4.3H2O for each unit of the original salt that dissociates. The above equilibrium equation would apply since all three components would be present.
sincecuso4
5H2O and cuso4.3H2O are both solids.
Kp=p(H2O)
1.086×104

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