AIIMS AIIMS Solved Paper-2014

  • question_answer
    The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 at \[27{}^\circ C\] is to a volume of \[\text{1}00\text{ d}{{\text{m}}^{\text{3}}}\]

    A) \[42.3J\,mo{{l}^{-1}}{{K}^{-1}}\]               

    B) \[38.3\,J\,mo{{l}^{-1}}{{K}^{-1}}\]

    C) \[35.8\,\,J\,mo{{l}^{-1}}{{K}^{-1}}\]        

    D) \[32.3\,\,J\,mo{{l}^{-1}}{{K}^{-1}}\]

    Correct Answer: B

    Solution :

                    \[\Delta S=2.303n\log \frac{{{V}_{2}}}{{{V}_{1}}}\] \[\Delta S=2.303\times 2\times 8.314\times \log \frac{100}{10}\] \[\Delta S=38.3Jmo{{l}^{-1}}{{K}^{-1}}\]


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