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JCECE Engineering JCECE Engineering Solved Paper-2012

  • question_answer
    If \[1\] mole of an ideal gas expands isothermally at \[{{37}^{o}}C\] from \[15\,\,L\] to\[25\,\,L\], the maximum work obtained is

    A) \[12.87\,\,J\]                     

    B) \[6.43\,\,J\]

    C)  \[8.57\,\,J\]                      

    D)  \[2.92\,\,J\]

    Correct Answer: A

    Solution :

    \[{{W}_{rev.}}=-2.303nRT\log \frac{{{V}_{2}}}{{{V}_{1}}}\]          \[=-2.303\times 1\times 0.0821\times (273+37)\log \frac{25}{15}\]          \[=-2.303\times 0.0821\times 310\log \frac{5}{3}\]          \[=-13\,\,J\approx -12.87\,\,J\]


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