They are impregnated with 1 molar solution of vanadium

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They are impregnated with a 1 molar solution of vanadium salt, 10 mm diameter spherical alumina particles, water saturation. it is desired that the concentration of the salt in all the points of the latter sea at least 0.8 mol / L. The coefficient of convective mass between the sine of the liquid and the surface of the particles is 5.4×10-3 m / h. the diffusivity of the salt in the water that fills the pores is 1.5×10-8 m2 / s determine:
a- The duration of impregnation
b- The saline concentration at 2 mm distance from the external surface of the particles after the time lost in (a)

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