Question 420: 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 :

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: