Question

A gas ${}^{\prime }{X}^{\prime }$ diffuses five times as rapidly as another gas ${}^{\prime }{Y}^{\prime }$. Calculate the ratio of molecular weights of ${}^{\prime }{X}^{\prime }$ and ${}^{\prime }{Y}^{\prime }$.

Answer 1

$\frac{r_x}{r_y}=5=\sqrt{\frac{M_Y}{M_X}}$

$\Rightarrow \frac{M_Y}{M_X}=25\therefore \frac{M_X}{M_Y}=\frac{1}{25}$