Consider a gas of triatomic molecules. The molecules are assumed to the 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 $......RT$
A$4.5$
B$1.5$
C$2.5$
D$3$
JEE MAIN 2020, Medium
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D$3$
d $DOF =3+3=6$
$U =\frac{ f }{2} nRT =3 RT$
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