$A$ $He$ atom is twice as heavy as a hydrogen molecule. At $25\,^oC$,the kinetic energy of a $He$ atom is:

Which technique is commonly used to separate a mixture of two gases based on their rates of diffusion?

The energy of an ideal gas depends only on its

The mass of molecule $A$ is half the mass of molecule $B$. The $rms$ speed of $A$ is twice the $rms$ speed of $B$. If the number of molecules in samples of $A$ and $B$ are equal,what is the ratio of the pressures of samples $A$ and $B$ in separate containers of equal volume?

The diffusion coefficient of an ideal gas is proportional to its mean free path and mean speed. The absolute temperature of an ideal gas is increased $4$ times and its pressure is increased $2$ times. As a result,the diffusion coefficient of this gas increases $x$ times. The value of $x$ is

Which of the following combinations of gases is the easiest to separate?