A well-mixed open pond contains wastewater that is contaminated with a dilute concentration of dissolved methylene chloride. The pool is rectangular with dimensions of 500m by 100m. Air 27C at and 1.0atm blows parallel to the surface of the pond as shown in the figure 1 with a velocity of 7.5m/s. At 20C and 1.0atm, the diffusion coefficient of methylene chloride in air DAB=0.085cm2/s and the kinematic viscosity of the air =0.15cm2/s. Figure 1 wastewater pond a) At what position across the pond is the air no longer laminar? b) Determine the mean gas-film mass-transfer coefficient associated with the transfer of methylene chloride