Question:
Consider a gas of triatomic molecules. The molecules are assumed to the triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature $\mathrm{T}$ is :
Correct Option: , 4
Solution:
$\mathrm{DOF}=3+3=6$
$\mathrm{U}=\frac{\mathrm{f}}{2} \mathrm{nRT}=3 \mathrm{RT}$