Question

A straight glass tube has two inlets $X$ and $Y$ at the two ends. The length of the tube is $200$ cm. $HCl$ gas through inlet $X$ and $N{H}_3$ gas through inlet $Y$ are allowed to enter the tube at the same time. White fumes first appear at a point $P$ inside the tube. The distance of $P$ (in cm) from $X$ is:

Answer 1

According to graham's law,

$\frac{r_{HCl}}{r_{N{H}_3}}=\sqrt{\frac{M_{N{H}_3}}{M_{HCl}}}$

$\frac{d}{200-d}=\sqrt{\frac{17}{36.5}}$

$d=81.12cm$

The distance of $P$ from $X=81.12cm$