Answer: translational kinetic energy.
- A translational kinetic energy
- B the same rms speed value
- C the same molecular mass
- D the same molar volume
Correct answer: A. translational kinetic energy
Explanation: Average translational KE = (3/2)kT depends only on temperature, so it is equal for all gases.
Not all gas molecules move at the same speed - the Maxwell-Boltzmann distribution shows the spread, with the most probable speed vp slightly less than the average vavg, which is slightly less than the root-mean-square speed vrms used in the pressure formula.
Concept context
Kinetic theory of gases connects molecular motion to pressure and temperature, explaining gas laws, specific heats, and molecular speeds.