20 cm3 of water at the same temperature is added to the first phase, which is prepared by dissolving some iodine in 10 cm3 of carbon sulfide at constant pressure and at 18 oC. After waiting for the well-shaken mixture to reach equilibrium, it is experimentally determined that 1.29 g and 0.0064 g of iodine are present in the carbon sulfide and water phases, respectively. Find the diffusion coefficient of iodine between the carbon sulfide and water phases.

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