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3. Consider the mass transfer of species A from a flat plate to a stagnant fluid having an initial concentration CA.D. An example would be a dissolving plate. At time t=0, the surface of the plate starts to dissolve in the fluid and the concentration of A in the fluid at the plate boundary rises to CA.1. For this unsteady-state problem, assuming that the solubility of A is very small, the concentration profile in the fluid is given by: CA CAO -=1-erf CAI CAO 4.DAB Assuming that the convective mass transfer coefficient is defined by: NA = K(CA1 - CAO) Develop an expression for k, the mass transfer coefficient of A using a concentration driving force, for transport from the plate surface to the fluid