If the total molar flux is zero in a binary system of A and B, which is always t
ID: 519751 • Letter: I
Question
If the total molar flux is zero in a binary system of A and B, which is always true? (a) N_A = 0 and N_B = 0. (b) N_A = -N_B (c) sigma x_i v_i = 0 (d) J_A = 0 and J_B = 0. (e) J_A = N_A and N_B = J_B. (f) The mass transfer coefficient, k_c, is zero. For a binary system of A and B undergoing unimolecular diffusion of species A. (a) N_B = 0 (b) N_B = J_B (c) D_M = N_A/(d) N_A = I_A/(I - x_A) Which of the following is true of the isotherm models we discussed for adsorption (a) For the Freundlich model, q = kp^1/, k represents the adsorption rate constant. (b) For the Langmuir model, q = k_qmP/1 + k_p, q_m is the maximum solute loading on the sorbent surface. (c) The Freundlich model is based on physical models for the adsorption-desorption process. (d) Tire parameters obtained for one sorbent can be used for a variety of solutes. Which of the following is true of adsorption in general? (a) Steric effects (size of solute molecule relative to sorbent surface morphology) are important in determining solute loading. (b) Chemical interactions (polarity, etc.) between the solute and sorbent can be important in determining solute loading. (c) Sorbents with a narrow pore size distribution (such as zeolites) are more effective than other sorbents. (d) Sorbents with smooth surfaces are generally preferable to rough, porous surfaces. Given the ternary' diagram below, which are true? (a) Location P has a composition of 30% A. (b) At equilibrium, it is possible to observe a single phase with composition corresponding to location Q. (c) Given feed streams containing pure C and 20% 8 in A, it is possible to mix those to location Q. (d) Given feed streams containing pure C and 60% 8 in A, it is possible to obtain a product stream with 90% B. (e) At location Q, the ratio of product streams is approximately 3:1. (f) At location Q, the more abundant product stream has a composition of approximately 75% B, 20% A.Explanation / Answer
Answer:
1. If the total molar flux is zero in a binary system Of A and B, Which is always true?
e. JA=NA and JB=NB
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