Chapter 6, Problem 6.128QP

Interpretation Introduction

Interpretation: The ratio of the root-mean-square speed of ${}^{\text{238}}{\text{UF}}_{\text{6}}$ to that of ${}^{\text{235}}{\text{UF}}_{\text{6}}$ at constant temperature is to be predicted.

Concept introduction: The Graham’s law of effusion states that, “the rate of effusion of gaseous molecules is inversely proportional to the square root of its molar mass of the gas molecules”.

$r\propto \frac{1}{\sqrt{m}}$

To determine: The ratio of the root-mean-square speed of ${}^{\text{238}}{\text{UF}}_{\text{6}}$ to that of ${}^{\text{235}}{\text{UF}}_{\text{6}}$ at constant temperature.