A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature \( T \). Conside...

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A gas mixture consists of 3 moles of oxygen and 5 moles of argon at temperature \( T \). Considering only translational and rotational modes, the total internal energy of the system is
(a) \( 12 \mathrm{RT} \)
(b) \( 15 R T \)
(c) \( 20 R T \)
(d) \( 4 R T \)
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