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:

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Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods whose

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Correct answer: D. 3RT

The formula of internal energy of a gas is given by

$U = \dfrac{f}{2}RT$

Here $R is the gas constant and$ T $is temperature.</p><p>\left(R = 8 . 314J{mol}^{- 1}{K}^{- 1}\right)$

For the given configuration of triatomic molecules, the degree of freedom $f = 6$

$⇒ U = \dfrac{6}{2}RT = 3RT$

Consider a gas of triatomic molecules. The molecules are assumed to...

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