A fixed container holds oxygen and helium gases at the same temperature. Which of the following statements are correct? (There could be more than one correct choice.)
A) The oxygen molecules have the greater average kinetic energy.
B) The oxygen molecules have the greater speed.
C) The helium molecules have the greater average kinetic energy.
D) The helium molecules have the greater speed.
E) The helium molecules have the same average kinetic as the oxygen molecules.

Question

Quizplus · Accepted Answer

At the same temperature, all gases have the same average kinetic energy due to the kinetic theory of gases, which explains choice E. However, because helium atoms are lighter than oxygen molecules, they move faster to maintain the same kinetic energy, which explains choice D.

A Fixed Container Holds Oxygen and Helium Gases at the Same