Chapter 18, Problem 18.20P

(a)

Interpretation Introduction

Interpretation:

Value of absorbance that corresponds to $\text{45 \% }T$ has to be calculated.

Concept Introduction:

Expression to compute absorbance as per Beer’s law is as follows:

  $A=\epsilon \cdot b\cdot c$

Expression to compute transmittance from absorbance is as follows:

  $T={10}^{-\text{A}}$

Here,

$\epsilon$ denotes molar absorptivity of species capable top absorb.

$b$ denotes path length in centimeters.

$c$ denotes concentration of species capable top absorb

$A$ denotes absorbance.

$T$ denotes transmittance.

(b)

Interpretation Introduction

Interpretation:

Concentration in $\text{mol/L}$ as per ideal gas equation has to be calculated.

Concept Introduction:

Ideal gas equation is given below:

  $PV=nRT$

Here,

$R$ is universal gas constant.

$V$ denotes the volume.

$n$ denotes the moles.

$T$ denotes the temperature.

$P$ denotes the pressure.

(c)

Interpretation Introduction

Interpretation:

Molar absorptivity of pyrazine at $366\text{ nm}$ has to be calculated.

Concept Introduction:

Refer to part (a).