A·4H 2 O(s) ⇌ A·H 2 O(s) + 3H 2 O(g) has K p = 1.0×10 -6 atm 3 at a certain temperature. If the aqueous tension at that temperature is 38 torr, at what relative humidity of air will the tetrahydrate e

Question

A·4H 2 O(s) ⇌ A·H 2 O(s) + 3H 2 O(g) has K p = 1.0×10 -6 atm 3 at a certain temperature. If the aqueous tension at that temperature is 38 torr, at what relative humidity of air will the tetrahydrate effloresce?

TestHub · Accepted Answer

K p = (P H2O ) 3 = 1.0×10 -6 atm 3 P H2O = 1.0×10 -2 atm = 7.6 torr Relative humidity = 7.6/38×100 = 20% Efflorescence needs the vapour pressure in air to be below the equilibrium value, so relative humidity below 20%. This is option (c).

Chemistry - Chemical Equilibrium Question with Solution | TestHub

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