48. Which of the following statements is incorrect regarding molecules of an ideal gas?
(A) Molecules of an ideal gas undergo many collisions with each other and the container walis.
(B) The molecules of an ideal gas are relatively far apart.
(C) Molecules of greater mass have a lower average speed than that of less mass at the same temperature.
(D) The average speed of molecules from samples of different "ideal" gases is the same at the sametemperature.
(E) All molecules of an ideal gas have the same average kinetic energy at a constant temperature.