12. The solubility of MgSO4*7H2O in water at 333 K is 4.50 mol/1000 g H2O. During 45 minutes of constant stirring, 6.52 mol of salt dissolved in a volume of 10 liters. The surface area of the salt (horizontal surface) is 4 cm2. Diffusion coefficient of MgSO4 in water D=1.86*10-9 m2/s. Determine the concentration in the volume of solution after 0.5 hours, the value of coefficient B, and the thickness of the diffusion layer b.

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