Question

At ordinary temperature, the molecules of an ideal gas have only translational and rotational kinetic energies. At high temperatures they may also have vibrational energy. As a result of this at higher temperatures (C_v = molar heat capacity at constant volume) :–

(a) C_v = 3R/2  for a monoatomic gas

(b) C_v > 3R/2 for a monoatomic gas

(c) C_v > 5R/2 for a diatomic gas

(d) C_v = 5R/2 for a diatomic gas

Answer 1

Correct option (c) C_v > 5R/2 for a diatomic gas

Explanation:

 Monoatomic gas C_v = 3R/2

This value is same for high temperature also, In case of diatomic gas

C_v = 5R/2 (at low temperature)

Also,C_v > 5R/2  (at high temperature due to vibrational kinetic energy)

Comments

Can you please elaborate this answer