The following data were obtained by gas-liquid chromatography on a 40-cm packed column:

Compound	Retention Time tR, min	Width of peak Base (W), min
Air	1.9	-
Methylcyclohexane	10.0	0.76
Methylcyclohexene	10.9	0.82
Toluene	13.4	1.06

Calculate

(a) an average number of plates from the data

(b) the standard deviation for the average in (a).

(c) an average plate height for the column.E.

Referring to Problem, calculate the resolution for

(a) methylcyclohexene and methylcyclohexane.

(b) methylcyclohexene and toluene.

(c) methylcyclohexane and toluene.

If a resolution of 1.5 is desired in separating methylcyclohexane and methyl-cyclohexene in Problem

(a) how many plates are required?

(b) how long must the column be if the same packing is employed?

(c) what is the retention time for methylcyclohexene on the column of part (b)

If Vs and VM for the column in Problem are 19.6 ml and 62.6 mL respectively, and a nonretained air peak appears after 1.9 min, calculate

(a) the retention factor for each compound.

(b) the distribution constant for each compound.

(c) the selectivity factor for methylcyclohexane and methylcyclohexene.

Problems are best solved using spreadsheet.