Prove the following


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 :

  1. $\frac{9}{2} \mathrm{RT}$

  2. $\frac{3}{2} \mathrm{RT}$

  3. $\frac{5}{2} \mathrm{RT}$

  4. $3 \mathrm{RT}$

Correct Option: , 4



$\mathrm{U}=\frac{\mathrm{f}}{2} \mathrm{nRT}=3 \mathrm{RT}$

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