Select the correct answer.

Which statement is true according to the kinetic theory?

A. Molecules of different gases with the same mass and temperature always have the same average density.
B. Molecules of different gases with the same mass and temperature always have the same average volume.
C. Molecules of different gases with the same mass and temperature always have the same pressure.
D. Molecules of different gases with the same mass and temperature always have the same molecular mass.
E. Molecules of different gases with the same mass and temperature always have the same average kinetic energy.

The statement that is true according to the kinetic theory is: (E) Molecules of different gases with the same mass and temperature always have the same average kinetic energy.

This is because the average kinetic energy of gas molecules is directly proportional to the absolute temperature, ensuring that at a given temperature, all gaseous molecules have the same average kinetic energy.

For example, if two gases have the same mass and temperature, their molecules will possess the same average kinetic energy, despite potential differences in molecular mass.

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