Question: b) Van Deemter equation is directed by three terms: multiple paths (A), longitudinal diffusion (B), and mass transfer between phases (C). i) Justify why a

b) Van Deemter equation is directed by three terms: multiple paths (A), longitudinal diffusion (B), and mass transfer between phases (C). i) Justify why a capillary column gives better efficiency compared to a packed column in gas chromatography analysis. (Explain using any one of the van Deemter terms). (3 marks) ii) Figure 1 shows van Deemter plots for two packed column stationary phase particle diameters. Based on the plots, which stationary phase would give better separation. Explain your answer based on the mass transfer term effect. (3 marks) 10m 40 HETP (um) 20 5.m 0 8 2 Flow Rate (ml/min) Figure 1 van Deemter plot 2

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