Water at the bottom of a narrow metal tube is held at a constant temperature of 293 K. The total pressure of air (assumed dry) is 1.0 atm and the temperature is 293 K. Water evaporates and diffuses through the air in the tube, and the diffusion path is z2-z1 is 0.1524 m long. Calculate the rate of evaporation at steady state in kg mol/(m2-s). The diffusivity of water vapor at 298K is 0.30 x 10-4 m2/s
