19. To maintain a pressure close to 1 atm, an industrial pipeline containing ammonia gas is vented to ambient air. Venting is achieved by tapping the pipe and inserting a 3-mm diameter tube, which extends for 20 m into the atmosphere. The entire system is operating at 25C and DAB = 0.28 × 10- 4m2 /s (for ammonia in air). Assume that the conditions are appropriate for equimolar counter diffusion and that ammonia is species A and that the atmospheric air is species B (the air can be assumed to be in an imaginary chamber). (Hint: Assume a negligible mole fraction of air in the pipe and a negligible mole fraction of ammonia in the atmosphere. Also, no chemical reactions occur, assume steady-state one-dimensional diffusion in the tube, constant properties, uniform temperature and total pressure in the tube, and there is ideal gas behavior). Determine the molar flow rate of ammonia (kmol/h) lost to the atmosphere. A. 0.70 × 10-9 to 1.39 × 10-9 kmol/h B. 1.40 × 10-9 to 2.09 × 10-9 kmol/h C. 2.10 × 10-9 to 2.79 × 10-9 kmol/h D. 2.80 × 10-9 to 3.49 × 10-9 kmol/h E. 3.50 × 10-9 to 4.19 × 10-9 kmol/h