Chapter 21, Problem 21.9P

(a)

Interpretation Introduction

Interpretation:

Value of $w_{1/2}$ has to be measured to nearest $0.1\text{ mm}$.

Concept Introduction:

Expression to compute number of theoretical plate is as follows:

  $N=\frac{5.55t_{\text{r}}{}^2}{w_{1/2}^2}$

Here,

$t_{\text{r}}$ denotes analyte’s  retention time.

$w_{1/2}$ denotes peak width at half-height.

$N$ denotes number of theoretical plate.

(b)

Interpretation Introduction

Interpretation:

Number of theoretical plates has to be measured for toluene and ethyl acetate peaks.

Concept Introduction:

Refer to part (a).