# Consider a gas of triatomic molecules. The molecules are assumed to be triangular and made of massless rigid rods phase vertices are occupied by atoms. The internal energy of a mole of the gas at temperature T is  Option: 1   Option: 2 Option: 3   Option: 4

Degree of freedom of the non-linear triatomic molecules is - 6

As we know that the internal energy of the triatomic gas is -

$\frac{f}{2}. R.T$

Now f = 6

So, Internal energy -

$\frac{6}{2}. R.T = 3RT$

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