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Caffeine and paracetamol have retention times of 11.80 and 13.25 min, respectively, on a 25.0-cm C18 column. An unretained species passes through the column in

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Caffeine and paracetamol have retention times of 11.80 and 13.25 min, respectively, on a 25.0-cm C18 column. An unretained species passes through the column in 1.15 min. The peak widths for caffeine and paracetamol are 1.01 and 0.95 min, respectively. Calculate the average number of plates in the column

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