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 E is true on average kinetic energy; and mass and temperature.  If gases from different types have same quantity of mass and same quantity of temperature then there will be same quantity in average kinetic energy.

Explanation:

The gaseous kinetic theory has the assumption that the size of molecules in any compound is very small compared to the distance between them. Also, the molecules are always in a vibration and it collides with boundary of cylinder and with each other.

In reference to the kinetic theory of gases, the different gases having different mass at same temperature always have the same quantity of average kinetic energy because the average kinetic energy of gases has directly proportional relation to the gaseous temperature.

The gas at higher temperature has higher kinetic energy amount and vice-versa.