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2. Beginning with a mixture of benzene and toluene in which toluene is 70 mol %: a. Use Figure 2B.2 to determine the MINIMUM number of theoretical plates needed to obtain benzene of at least 85 mol % purity. Indicate the answer below and sketch your work on the graph in Figure 2B.2. b. Calculate the MINIMUM height needed for a column with an HETP of 0.25 cm to obtain benzene of at least 85 mol % purity. c. Using Figure 2B.2, determine the original composition of the liquid whose vapor is found to contain 20 mol % benzene. Indicate your answer below and sketch your work on the graph in Figure 2B.2. 3. A binary mixture of benzene and toluene is injected into a GC packed column with a Car- bowax stationary phase. Benzene and toluene are found to have retention times of 2 and 5 minutes, respectively. Which component shows a greater affinity for the stationary phase? Why? a Compositional Diagram for a Binary Mixture of Benzene and Toluene 383.3 378.3 373.3 Temperature (K) 368.3 363.3 358.3 353.3 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 mol % Benzene Figure 2B.2