A gas mixture consists of \( 2 \mathrm{~mol} \) of \( \mathrm{O}_{2} \) and \( 4 \mathrm{~mol} \...

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A gas mixture consists of \( 2 \mathrm{~mol} \) of \( \mathrm{O}_{2} \) and \( 4 \mathrm{~mol} \) of Ar at temperature \( T \). Neglecting all vibrational modes, the total internal energy of the system is
(a) \( 4 R T \)
(b) \( 15 R T \)
(c) \( 9 R T \)
(d) \( 11 R T \)
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