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2. Two large tanks contain a mixture of N2 and O2, but at different concentrations. Tank A has 80 mole percent N2 and 20 mole percent 02, while tank B has 15 mole percent N2 and 85 mole percent 02. The volumes of tank A and tank B are 20 and 40 m, respectively. A tube with a length of 2.0 m and an inside diameter of 0.10 m connects the two tanks. Assume that the pressure is 1 atm and the temperature is 25 C. (a) By using the differential control-volume concept, derive the general expression for the flux of N2 between the two tanks as a function of the partial pressure of N2. List all the assumptions you made to obtain the N2 flux. (12%) (b) The diffusion coefficient of N2 in O2 is 2.0x10 m/s at the given conditions. Calculate the rate of N2 diffusion between the tanks. (4%) (c) By the use of the "film concept" for mass transfer, find the convective mass-transfer coefficient. (4%)