Graham's DIffusion Law

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49 u. Molecular mass of B will be:

From a heated mixture of nitrogen, oxygen and carbon, two compounds (out of the many obtained) are isolated. The rates of diffusion of the two isolated compounds are almost identical. The two compounds are

Pure ${\mathrm{O}}_2$ diffuses through an aperture in $224 \sec ,$ where as mixture of ${\mathrm{O}}_2$ and another gas containing $80\% {\mathrm{O}}_2,$ diffuses from the same in $234 \sec .$ What is molecular weight of the gas.

A gas mixture contains equal number of molecules of ${\mathrm{N}}_2$ and ${\mathrm{SF}}_6,$ some of it is passed through a gaseous effusion apparatus. Calculate how many molecules of ${\mathrm{N}}_2$ are present in the product gas for every $100$ molecules of ${\mathrm{SF}}_6.$

From a certain apparatus, the diffusion rate of hydrogen has an average value of $28.7 \mathrm{c}{\mathrm{m}}^3\mathrm{ }{\mathrm{s}}^{-1}$. The diffusion of another gas under the same conditions is measured to have an average rate of $7.2 {\mathrm{cm}}^3{\mathrm{s}}^{-1}$. Identify the gas.

From a certain apparatus, the diffusion rate of hydrogen has an average value of $28.7 \mathrm{c}{\mathrm{m}}^3\mathrm{ }{\mathrm{s}}^{-1}$. The diffusion of another gas under the same conditions is measured to have an average rate of $7.2 {\mathrm{cm}}^3{\mathrm{s}}^{-1}$. Identify the gas.(Oxygen/Nitrogen)

The degree of dissociation $\left(\mathrm{\alpha }\right)$ of the reaction ${{\mathrm{A}}_2}_{\left(\mathrm{g}\right)}\rightleftharpoons 2{\mathrm{A}}_{\left(\mathrm{g}\right)}$  in terms of rate of diffusion $\left({\mathrm{r}}_{mix}\right)$ of equilibrium mixture and that of a reference gas $\mathrm{C}$ is given by: 

where $\mathrm{M}$ stands for the respective molar masses.

In $5 \mathrm{s}$, the volume $\mathrm{X}$of ${\mathrm{H}}_2$ gas effuses through a hole in a container. The time taken for the effusion of the same volume of the specified gas under identical conditions is

$\mathrm{He}\left(\mathrm{g}\right)$ at $1 \mathrm{atm}$ and ${\mathrm{O}}_2\left(\mathrm{g}\right)$ at $4 \mathrm{atm}$ pressure are effused through a small orifice under similar conditions, ratio of their rate of effusion is -

Molar ratio in which $\mathrm{He}$ and ${\mathrm{CH}}_4$ should be mixed so that when mixture is allowed to effuse through pinhole, initially both gases comes out at equal rate? 

$50 \mathrm{mL}$ of each gas $\mathrm{A}$ and of gas $\mathrm{B}$ takes $150$ and $200$ seconds respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas $\mathrm{A}$ is $36$, the molecular mass of gas $\mathrm{B}$ will be :

A gas is effusing in vacuum at rate ${\mathrm{r}}_1$ and in air at rate ${\mathrm{r}}_2$, then :

Calculate relative rate of effusion of ${\mathrm{O}}_2$ to ${\mathrm{CH}}_4$ through a container containing ${\text{O}}_2$ and ${\mathrm{CH}}_4$ in $3:2$ mass ratio :-

The rate of diffusion of ${\mathrm{CH}}_4$ at a given temperature is twice that of a gas $\mathrm{X}$. The molecular weight of $\mathrm{X}$ is :-

At constant pressure and temperature the rates of diffusion ${\mathrm{r}}_{\mathrm{A}}$ and ${\mathrm{r}}_{\mathrm{B}}$ of gases $\mathrm{A}$ and $\mathrm{B}$ having densities ${\mathrm{d}}_{\mathrm{A}}$ and ${\mathrm{d}}_{\mathrm{B}}$ are related as :-

The molecular weight of a gas which diffuses at $1/6^{\mathrm{th} }$ of the speed of hydrogen under identical conditions is :-

Which pair of the gaseous species diffuse through a small jet with the same rate of diffusion at same $\mathrm{P}$ and $\mathrm{T}$ :-

If the rate of diffusion of unknown gas is twice that of methane gas under identical condition of temperature and pressure, the molar mass of the unknown gas is

Four gas balloons $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ of equal volumes containing ${\mathrm{H}}_2, {\mathrm{H}}_2\mathrm{O}, \mathrm{CO}, {\mathrm{CO}}_2$ respectively were pricked with needle and immersed in a tank containing ${\mathrm{CO}}_2$ at same pressure which of them will not shrink after some time :

A certain gas diffuses from two different vessels $\mathrm{A}$ and $\mathrm{B}$. The vessel A has a circular orifice and vessel $\mathrm{B}$ has square orifice and radius of the orifice of vessel $\mathrm{A}$ is equal to side of orifice of vessel $\mathrm{B}$. The ratio of rate of diffusion of gas from vessel $\mathrm{A}$ to vessel $\mathrm{B}$, assuming same temp and pressure is.