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The effectiveness of this method, the surface of a 1 mx 5 m rectangular container filled with water was covered with a 0.002-m-thick layer of the chemical. Since the water and the chemical are only slightly miscible the rate of water evaporation can be determined by calculating the diffusion of water through the stagnant chemical film. Using the data given below, calculate the mass transfer coefficient k, and the rate at which water evaporates. The diffusion coefficient for water through the film is 2.30 x 10 m/s. The concentration of water in the chemical at the liquid-liquid interface is Cw1 0.3 kgmol/m. The concentration of water in the chemical at the gas-liquid interface is Cw= 0.05 kgmol/m. Assume that the molar density of the chemical is 0.35 kgmol/m.