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Punjab Medical Punjab - MET Solved Paper-2007

  • question_answer
    2 mole of ideal gas at                                                                                                              \[{{27}^{o}}C\]  temperature is expanded reversibly from                                                                                                                    \[2\,\,L\]  to\[20\,\,L\]. Find entropy change\[(R=2cal/mol\,\,K)\]

    A) \[92.1\]                               

    B) \[0\]

    C) \[4\]                                     

    D) \[9.2\]

    Correct Answer: D

    Solution :

    \[\Delta S\](Entropy change)\[=2.303nR{{\log }_{10}}\frac{{{V}_{2}}}{{{V}_{1}}}\]                 \[=2.303\times 2\times 2\times {{\log }_{10}}\frac{20}{2}\]                 \[=2.303\times 2\times 2\times 1\]                 \[=9.212cal\]


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