n-hexane is evaporating from a square beaker with 10 cm long sides and has a total height of 40 cm. The initial height of hexane in the beaker is 12 cm. Pure air is flowing over the top of the beaker at a total pressure of 1 atm. DAs (294 K) = 0.080 cm/s; P* (278K) = 7875 Pa a) Determine the steady-state molar flux and the steady-state molar flow rate of n-hexane at a temperature of 5 C. Give your answer in kgmol/sm. (25 points) b) Derive an equation for the total time to evaporate all of the n-hexane in terms of the height of the liquid in the beaker (z) and the total height of the beaker (H) as shown in the figure below. In this case za is the initial height of the liquid and the final liquid height z = 0. (25 points) H Z