Problem 5 (10 points) Consider water in a 25-mm-diameter test tube evaporating into dry air at 1 atm. The distance 1 from the water-air interface to the top of the tube is L=15 cm. The mass fraction of the water vapor at the water-air interface is 0.0235, and the binary diffusivity of water vapor in air is 2.6x10 m/s. a) Determine the mass evaporation rate of the water b) Determine the water vapor mass fraction at x=L/2. c) Plot the water vapor mass fraction from x = 0 to x=L d) Determine the fraction of the water mass flow that is contributed by bulk flow and the fraction contributed by diffusion at x=L/2