61. Solving a chemistry problem

6. Determine the retained volume and the number of plates for m- and p-xylene on a column with n,n´-azocyphenetol on Chromosorb R. The carrier gas is carbon dioxide, its flow rate is 21.74 cm3/min. Retention time of m-xylene 279.7 s, p-xylene 298.5 s. The speed of the chart tape is 600 mm/h, the half-width of the m-xylene and p-xylene peaks is 7 and 9 mm, respectively.