On a certain day,the humidity in the atmosphere is $1\%$. If the barometer reads $760 \ mm \ of \ Hg$,what will be the pressure of the dry gas in $mm \ of \ Hg$?

The density of phosgene $(COCl_2)$ gas at $STP$ is........

$A$ certain volume of oxygen gas diffuses through a porous pot in $20 \ s$. If the same volume of another gas $(X)$ diffuses in $Y \ s$, then $(X)$ and $Y$ respectively are:

If the rate of diffusion of gas $A$ is $5$ times that of gas $B$,what will be the ratio of the density of $A$ to the density of $B$?

$A$ closed container contains a mixture of non-reacting gases $A$ and $B$. The partial pressures of $A$ and $B$ are $4.5 \ bar$ and $5.5 \ bar$ respectively. Find the mole fractions of $A$ and $B$ respectively.

The rate of diffusion of two gases $x$ and $y$ is $10 \ mL/sec$ and $40 \ mL/sec$ respectively. The ratio of their molar masses $(Mw)_{x} : (Mw)_{y}$ is: