Calculate the relative rates of diffusion for ${ }^{235}{\mathrm{UF}}_6 \mathrm{and}{ }^{238}{\mathrm{UF}}_6$

Molar mass of  ${ }^{235}{\mathrm{UF}}_6\left({\mathrm{M}}_1\right)=235$

Molar mass of${ }^{238}{\mathrm{UF}}_6\left({\mathrm{M}}_2\right)=238$

Relative rates $\left[\frac{{\mathrm{r}}_1}{{\mathrm{r}}_2}=?\right]$

$\frac{{\mathrm{r}}_1}{{\mathrm{r}}_2}=\sqrt{\frac{M_{\mathit{2}}}{M_1}}=\sqrt{\frac{238}{235}}$

$=\sqrt{1.01}$

$=1.004$