Question

At ordinary temperatures, the molecules of a diatomic gas have only translational and rotational kinetic energies. At high temperatures, they may also have vibrational energy. As a result of this, compared to lower temperatures, a diatomic gas at higher temperatures will have 

(a) lower molar heat capacity 

(b) higher molar heat capacity 

(c) lower isothermal compressibility 

(d) higher isothermal compressibility

Answer 1

Correct Answer is: (b) higher molar heat capacity

Vibrational energy involves additional degrees of freedom. The molar heat capacity is proportional to the number of degrees of freedom.