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NEET NEET SOLVED PAPER 2017

  • question_answer
    A gas mixture consists of 2 moles of\[{{O}_{2}}\]and 4 moles of Ar at temperature T. Neglecting all vibrational modes, the total internal energy of the system is                                                                                            

    A) \[11\,RT\]                           

    B) \[4RT\]

    C) \[15\,RT\]                           

    D)   \[9\,RT\]

    Correct Answer: A

    Solution :

                     \[U={{n}_{1}}\frac{{{f}_{1}}}{1}RT+{{n}_{2}}\frac{{{f}_{2}}}{2}RT\]                 \[=2\times \frac{5}{2}RT+4\times \frac{3}{2}RT\]                 \[=5RT+6RT\]                 \[U=11\,RT\]


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