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JEE Main & Advanced Physics Thermodynamical Processes Question Bank Critical Thinking

  • question_answer
    A gas mixture consists of 2 moles of oxygen and 4 moles argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is [IIT 1999; UPSEAT 2003]

    A)            4 RT                                          

    B)            15 RT

    C)            9 RT                                          

    D)            11 RT

    Correct Answer: D

    Solution :

                       Oxygen is diatomic gas, hence its energy of two moles \[=2\times \frac{5}{2}RT=5RT\] Total Internal energy \[=(6+5)RT=11RT\] Argon is a monoatomic gas, hence its internal energy of 4 moles \[=4\times \frac{3}{2}RT=6RT\]


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