NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी NEET PYQ-Thermodynamics

  • question_answer
    The entropy change in the fusion of one mole of a solid melting at \[{{27}^{o}}C\] (Latent heat of fusion,\[2930\text{ }J\text{ }mo{{l}^{-1}}\]) is:                                                                                          [AIPMT 2000]

    A)  \[9.77\text{ }J\text{ }{{K}^{-1}}mo{{l}^{-1}}\]         

    B)  \[10.73\text{ }J\text{ }{{K}^{-1}}mo{{l}^{-1}}\]

    C)  \[2930\text{ }J\text{ }{{K}^{-1}}mo{{l}^{-1}}\]

    D)                   \[108.5\text{ }J\text{ }{{K}^{-1}}mo{{l}^{-1}}\]

    Correct Answer: A

    Solution :

    \[\Delta {{S}_{f}}=\frac{\Delta {{H}_{f}}}{{{T}_{f}}}\]
                \[\Delta {{S}_{f}}=\frac{2930\,J\,mo{{l}^{-1}}}{300\,K}=9.77\,J\,{{K}^{-1}}\,mo{{l}^{-1}}\]


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