Question: It is required to estimate the average mass-transfer rate per unit area of benzene evaporating from the outer surface of a circular cylinder across which air is flowing at 6 m/s. The driving force B has been evaluated to be 0.90. It is found that if a cylinder of the same diameter is placed in the same airstream, the heat-transfer coefficient is h = 85W/(m2. K). Estimate the mass-transfer rate explaining in detail the reasons for any assumptions that you build into the analysis. Evaluate the concentration of benzene in the 0 state, assuming no chemical reaction.