Chapter 2, Problem 2.55P

Interpretation Introduction

(a)

Interpretation:

The units of D_o and E should be identified.

Concept introduction:

Diffusivity is calculated as follows.

$D=D_o\exp (-E/RT)$

Where,

D_o = the preexponential factor.

E = the activation energy for diffusion.

R = 1.987 $\text{cal}/\text{(mol×K}\text{)}$.

Interpretation Introduction

(b)

Interpretation:

The plot for straight line on rectangular coordinates should be explained.

Concept introduction:

Diffusivity is calculated as follows.

$D=D_o\exp (-E/RT)$

Where,

D_o = the preexponential factor.

E = the activation energy for diffusion.

R = 1.987 $\text{cal}/\text{(mol×K}\text{)}$

Interpretation Introduction

(c)

Interpretation:

Plot the data in rectangular coordinates and find the values for D₀ and E from the resulting line.

Concept introduction:

Diffusivity is calculated as follows:

$D=D_o\exp (-E/RT)$

Where,

D_o = the preexponential factor.

E = the activation energy for diffusion.

R = 1.987 $\text{cal}/\text{(mol×K}\text{)}$.