Chapter 5, Problem 5.98QP

Interpretation Introduction

Interpretation:

The time taken for effusion of 1.00 L of Helium, $\text{He}$ under the given conditions has to be calculated

Concept Introduction:

Root-mean-square (rms):

The root-mean-square molecular speed (u) is given by the below formula.

$\begin{array}{l}u\text{=}\sqrt{\frac{3\text{RT}}{{\text{M}}_{\text{m}}}}\\ ={\left(\frac{3\text{RT}}{{\text{M}}_{\text{m}}}\right)}^{\frac{1}{2}}\end{array}$

Where,

R is the molar gas constant

T is the absolute temperature

${\text{M}}_{\text{m}}$ is the molar mass of the gas

Graham’s law of effusion:

$\text{Rate of effusion of molecules }\propto \frac{\text{1}}{\sqrt{{\text{M}}_{\text{m}}}}$

Where,

${\text{M}}_{\text{m}}$ is the molar mass of the gas