the following data were obtained by gas-liquid chromatography on a 40-cm packed

Question

the following data were obtained by gas-liquid chromatography on a 40-cm packed column: Compounds tr, min W, min air                                                    1.9 methylcyclohexane                       10.0    0.76 methylcyclohexene                       10.9 0.82 toluene                                          13.4 1.06

Calculate: 1) the average plate height of the column 2) the resolution for methylcyclohexane & methylcyclohexene 3) if the resolution of 1.5 is desired in separatig methylcyclohexane & methylcyclohexene, how many plates are required?

Explanation / Answer

Number of plate = 16(tR/W)^2 = 2770
Avg. height = 40/2770= 1.5X10^-4 m
Resolution of column = (tR2-tR1)/W = 0.9/[(0.76+0.82)/2]= 1.1

For resolution= 1.5
N= 2770*(1.5)^2*(1.1/0.1)^2*(2.47/0.47)^2/121*1.47 = 6.4*10^3

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.