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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