Three gases ${\mathrm{CO}}_2, {\mathrm{O}}_2$ and ${\mathrm{Cl}}_2$ are at the same temperature at 25 °C. Which of the following relations for the average kinetic energy (E) is true?

Energy of motion of 1 mole of gas$=\frac{3}{2}RT\cdots \left(1\right)$

where R is the gas constant and T is the temperature.
The Maxwell generalisation, or Eq (1), states that at a given temperature, a mole of every gas has the same kinetic energy, which is equal to $\frac{3}{2}\mathrm{RT}$

As a result, the kinetic energy of all three gases—CO₂, O₂, and Cl₂ is $\frac{3}{2}\mathrm{RT}$