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Course: CE 320-MASS TRANSFER; Test: 1; Date: 06/07/2022; Time: 2 hrs Instruction: Answer all questions Question 1 In Industrial plants separation units are many and constitute a major cost component towards capital investment and, maintenance and operation (MO) costs. Briefly distinguish between physical and mass transfer separation techniques A) B) C) THE COPPERBELT UNIVERSITY SCHOOL OF MINES AND MINERAL SCIENCES CHEMICAL ENGINEERING DEPARTMENT D) (4 marks] One method of analysis of the mass transfer process is the distributed parameter model What is the distributed parameter model approach to mass transfer analysis? [2 marks] i) ii) iii) ii) Regarding your answer to Q1 B (i) above, what is the difference between molecular diffusion and mass transfer? [6 marks] Explain why two (2) composition variables of molar density and mass density are used in analysis of mass transfer processes [4 marks] A gas mixture at 300K and 500 kPa was analyzed to have molar composition of CH4 (88%), C₂H6 (4%), C3H8 (5%) and C4H10 (3%). Calculate: 1) The total molar density/concentration of the gas mixture [3 marks] The mass density of the gas mixture [6 marks] [Data: Ro= 8.314 kJ/kmol K. Atomic weights. H= 1; C = 12] Question 2 The analysis of mass transfer processes can be in terms of mode of mass transfer as dictatec external constraints and/or in terms of moving or stationary frames of reference A) State the Fick's 1st law of diffusion [2 marks] B) Briefly describe, with an example, the following modes of mass transfer: Stagnant diffusion [4 marks] Unequimolar counter diffusion [4 marks] Equimolar counter diffusion [4 marks]