A gas mixture consists of $2$ moles of $O_2$ and $4$ moles of $Ar$ at temperature $T$. Neglecting all vibrational modes, the total internal energy of the system is
  • A$4 RT$
  • B$15 RT$
  • C$9 RT$
  • D$11 RT$
IIT 1999,NEET 2017, Medium
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