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:

Options

A. `3/2` RT
B. 3RT
C. `5/2 `RT
D. `9/2 `RT

Answer

B

Explanation

`U=(f)/(2) nRT `
` U= 6/2 nRT`
` U= 3nRT` n=1
` U= 3RT`