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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    A mixture of gas consist of 2 moles of oxygen and 4 moles of argon at temperature T. If all vibrational modes as neglected, then the total energy of system is

    A)  3RT                            

    B)  9RT                 

    C)  11RT               

    D)  None of these

    Correct Answer: C

    Solution :

    Interval energy of n moles of an ideal gas at temperature T is given by \[U=n\left( \frac{f}{2}RT \right)\](degree of freedom) f, for \[{{O}_{2}}\] is 5 and for Ar is 3 \[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,\,U={{U}_{{{O}_{2}}}}+{{U}_{Ar}}\] \[=\,\,\,\,2\left[ \frac{5}{2}RT \right]+4\left[ \frac{3}{2}RT \right]\,\,=\,\,11\,RT\]


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