What is the $SI$ unit of viscosity?

Equal masses of helium and oxygen are mixed in an empty container at $25^{\circ} C$. What is the fraction of the total pressure exerted by helium?

Which of the following gas mixtures will not obey Dalton's law of partial pressure?

Air at sea level is dense. This is a practical application of

When $0.0168 \ mol$ of $O_2$ obtained from the decomposition of $KClO_3$ is collected over water at $25 \ ^oC$,the volume is $428 \ mL$ and the total pressure is $754 \ mm$. What is the aqueous tension (water vapor pressure) at $25 \ ^oC$ in $mm$?

The $O_2$ gas is collected over water at $400 \ K$ temperature in a $2 \ L$ vessel. If the total pressure of the mixture is $33.26 \ bar$ and the pressure of dry $O_2$ gas is $32.20 \ bar$,find the vapour pressure of water under the same conditions.