Which statement is true according to the kinetic theory?

Question

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.

Answer 1

According to the kinetic theory of gases, the correct statement is:

E. Molecules of different gases with the same mass and temperature always have the same average kinetic energy.

In the kinetic theory, it is stated that the average kinetic energy of gas molecules is directly proportional to the absolute temperature of the gas. Thus, at the same temperature, all gas molecules, regardless of their mass, will have the same average kinetic energy.