Chapter 19, Problem 19.68E

Interpretation Introduction

Interpretation:

The average displacement of one atom of $\text{He}$ in $\text{Ne}$ in given time intervals is to be calculated. Also the total distance travelled by $\text{He}$ in given time intervals are to be calculated.

Concept introduction:

The average displacement of the molecule in three dimensions is given by,

${\left(3\text{-D}\text{displacement}\right)}_{\text{avg}}^2=6\cdot D\cdot t$

Where,

• $D$ is the diffusion coefficient.

• $t$ is the time.

Displacement is a vector quantity while distance is scalar quantity. Distance can be calculated with the help of average velocity.