STANDARD Physics Internal Energy MCQ Question
A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
4 RT
9 RT
11 RT
15 RT
Correct Answer
Detailed Explanation
For diatomic oxygen with no vibrational mode, U₁ = 2 × 5/2 RT = 5RT. For monoatomic argon, U₂ = 4 × 3/2 RT = 6RT. Total energy U = U₁ + U₂ = 5RT + 6RT = 11RT.
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