Chapter 19, Problem 19.63E

Interpretation Introduction

Interpretation:

The diffusion constant for air is to be calculated.

Concept introduction:

The diffusion of any gas particle among its own gas particles is known as self-diffusion. The diffusion constant is directly proportional to the product of mean free path and average velocity. The self-diffusion of a particle is given as,

$D=\frac{3}{8d^2\rho }\cdot \sqrt{\frac{RT}{\pi M}}$

Where,

• $D$ is the self-diffusion constant.

• $M$ is the molar mass.

• $d$ is the diameter of given particles.

• $\rho$ is the particle density.

• $R$ is the gas constant.

• $T$ is the temperature.