Chemical A is evaporating from a flat surface of total length L into chemical B. Assuming that the concentration profile for chemical A in the concentration boundary layer is of the form C_A (y) = (y³ + y + )x³ in which , , and are constants. 1. Develop an expression for the mass transfer convective coefficient h_m (x) in terms of these constants, the concentration of chemical A in the free stream C_A, , and the mass diffusivity D_AB. 2. Find the average Sherwood number of the flow.