Question 362: Thermodynamics & KTG

Question

Consider a gas of triatomic molecules. The
molecules are assumed to be triangular and
made of massless rigid rods whose vertices
are occupied by atoms. The internal energy of
a mole of the gas at temperature T is :
![](https://imagex.cdn.examgoal.net/jgy2xukf24p4as/37e31867-4c02-4771-8ea8-2717a6c9dd92/035dbc40-f651-11ea-8293-3b6cc591631c/file-jgy2xukf24p4at-320w.png)

Accepted Answer

Degree of freedom (f) = 3 + 3 = 6 and n = 1
U = ${f \over 2}nRT$
= ${6 \over 2} 	imes 1 	imes RT$
= 3RT

Answer

${3 \over 2}RT$

Answer

${9 \over 2}RT$

Answer

${5 \over 2}RT$

Answer

3RT

Thermodynamics & KTG

Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is :

Choose the correct answer: