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.3 Gaseous mixtures of ammonia (A) and nitrogen (B) are contained in two tanks connected by a glass tube 61cm long with an inside diameter
.3 Gaseous mixtures of ammonia (A) and nitrogen (B) are contained in two tanks connected by a glass tube 61cm long with an inside diameter of 2.44cm (see figure) at T=298K and P=101.32kPa (both constant). The partial pressures of ammonia in the two tanks are 20.0 and 6.666kPa. The tanks are so large that these partial pressures can be considered constant, even though ammonia will diffuse through the tube from tank 1 to tank 2. Since an imbalance of the pressure between the two tanks would lead to a hydrodynamic flow through the tube, the total number of moles in each tank will remain constant. This means that nitrogen will diffuse from tank 2 to tank 1 at the same molar rate as ammonia is diffusing from tank 1 to tank 2. This process is called equimolar counterdiffusion. Assume that mass transfer through the tube is at steady state. The diffusivity for this system is 2.3105m2/s. a. Calculate the molar flow rates of ammonia and nitrogen through the tube in kmol/s. b. Calculate the partial pressures of ammonia and nitrogen at the midpoint in the tube ( 0.305m from each chamber). Plot the partial pressure profile of ammonia in the tube. c. Calculate the species velocities, vA and vB at both ends of the tube. d. Calculate the mass average velocity of the mixture, v, at both ends of the tube. Comment on your results
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