Diatomic molecules like hydrogen have energies due to both translational as well as rotational motion. From the equation in kinetic theory PV = 2/3 E,E isthe total energy per unit volume

Diatomic molecules like hydrogen have energies due to both translation

1.	Diatomic molecules like hydrogen have energies due to both translational as well as rotational motion. From the equation in kinetic theory PV = 2/3 E,E isthe total energy per unit volume
Answer» Solution :ACCORDING to kinetic theory equation, PV = 2/3 E [where P= Pressure V = volume]E is representing only translational part of ENERGY. Internal energy contains all TYPES of energies like translational, rotational, vibrational etc. But the molecules of an ideal gas is treated as point MASSES in kinetic theory, so its kinetic energy is only DUE to translational motion. Point mass does not have rotational or vibrational motion. Here, we assumed that the walls only exert perpendicular forces on molecules. They do not exert any parallel force, hence there will not be any type of rotation present. The wall produces only change in translational motion.