Chapter 21, Problem 21.12P

(a)

Interpretation Introduction

Interpretation:

Number of theoretical plates, plate height and $w_{1/2}$ has to be measured for heptane and $p\text{-difluorobenzene}$.

Concept Introduction:

Expression to compute number of theoretical plate is as follows:

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

Expression to compute plate height is as follows:

  $H=\frac{L}{N}$

Here,

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

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

$N$ denotes number of theoretical plate.

$L$ denotes length of chromatographic column.

$H$ denotes plate height.

(b)

Interpretation Introduction

Interpretation:

Value of $w$ has to be calculated from $w_{1/2}$ for each peak and corresponding resolution has to be calculated.

Concept Introduction:

Refer to part (a).