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JEE Main201911 Jan 2019Morning ShiftPhysicsKinetic Theory of GasesActual

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

Options

  1. A15 RT
  2. B12 RT
  3. C4 RT
  4. D20 RT

Correct answer

A. 15 RT

Step-by-step solution

U= f₁ 2 n₁ R T+ f₂ 2 n₂ R T Considering translational and rotational modes, degrees of freedom f ₁=5 and f ₂=3 u = 5 2 (3 RT )+ 3 2 5 RT U =15 RT

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