A gas mixture contains 2 moles of O₂ and 4 moles of Ne at temperature T. Neglect vibrational modes. The total internal energy is:
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Question

A gas mixture contains 2 moles of O₂ and 4 moles of Ne at temperature T. Neglect vibrational modes. The total internal energy is:

G1 Physics · Accepted Answer

For diatomic oxygen without vibration, U(O₂) = (5/2)nRT For n = 2: U(O₂) = (5/2)(2)RT = 5RT For monoatomic neon, U(Ne) = (3/2)nRT For n = 4: U(Ne) = (3/2)(4)RT = 6RT Total: U = 5RT + 6RT = 11RT Hence option B follows.