A gas mixture consists of $8$ moles of argon and $6$ moles of oxygen at temperature $T$. Neglecting all vibrational modes, the total internal energy of the system is
A $29 \mathrm{RT}$
B$20 \mathrm{RT}$
C$27 \mathrm{RT}$
D$21 \mathrm{RT}$
JEE MAIN 2024, Diffcult
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C$27 \mathrm{RT}$
c $\mathrm{U}=\mathrm{nC}_{\mathrm{V}} \mathrm{T}$
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