Question

If cuso4.H2o(s) cuso4. 3h2o(s) + 2h2o(v)kp = 1.08610 4 atm2 at 25c. The efflorescent nature of cuso4. 5h2o can be noticed when vapour pressure of h2o in atmosphere is

Answer 1

vapour pressure of h2o in atmosphere is heated

Answer 2

Answer:

< 7.92 mm

Explanation:

An efflorescent salt is one that loses H2O to atmosphere. For the reaction

CuSO4.5H2O(s) ⇔ CuSO4.3H2O(s) + 2H2O(I)

Kp = (P'H2O)^2 =1.086×10−4

P'H2O = 1.42×10^2 atm = 7.92 mm

.: If P'H2O at 25∘C<7.92 mm only, then reaction will proceed in forward

direction.