(15 Marks). Obtain the mass transfer coefficient k in m/s for evaporation of water into air in a 2-in.-diameter wetted-wall column at a Reynolds number of 10,000 and temperature 40C if the effective thickness of gas film is 0.16 cm. Given: viscosity of air=0.0186 cP and diffusivity for this air-water system = 0.2814 cm?/s