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NEET Sample Paper NEET Sample Test Paper-72

  • question_answer
    5 mole of an ideal gas expand reversibly from a volume of \[8 d{{m}^{3}}\,to 80 d{{m}^{3}}\] at a temperature of\[27{}^\circ C\]. Calculate the change in entropy.

    A) \[70.26 J{{K}^{-}}^{1}\]       

    B) \[82.55 J{{K}^{-}}^{1}\]

    C) \[95.73 J{{K}^{-}}^{1}\]                   

    D) \[107.11 J{{K}^{-}}^{1}\]

    Correct Answer: C

    Solution :

    Entropy change \[(\Delta S)\,\,=\,\,2.303\,\,nR\,\,log\,\,\frac{{{V}_{2}}}{{{V}_{1}}}\] \[= 2.303 \times  5 \times  8.314 \times  log\,\,\frac{80}{8} = 95.73 J{{K}^{-1}}\].


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