17. Solving a chemistry problem

5. When dissolving a fused compact plate of MgBr2 salt in a large volume of water under the conditions of a stationary diffusion process at a constant temperature, 36 g of salt was dissolved in the first 2 minutes. The effective salt surface was 20 cm2, the diffusion coefficient was 1.36*10-9 m2/s. The limiting solubility of MgBr2 under these conditions is 2.99 mol/L. Calculate the thickness of the diffusion layer in meters.