Question

A jar contains He and $H_2$ in the molar ratio 1:5. The ratio of mean translational kinetic energy is in the ratio at the same temperature is__________.

• A. 1:5
• B. 5:1
• C. 2:1
• D. 1:1

Answer 1

The correct option is D 1:1

As we know,
kinetic energy per molecule is
$KE/molecule=\overline{KE}=\frac{3}{2}\frac{R}{N}T=\frac{3}{2}kT$ independent of mass so it will be equal for both gases at same temperature.