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NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    Combustion of sucrose is used by aerobic organisms for providing energy for the life sustaining processes. If all the capturing of energy from the reaction is done through electrical process (non P-V work) then calculate maximum available energy which can be captured by combustion of 34.2 g of sucrose Given: \[\Delta {{H}_{combustion}}\left( sucrose \right)=-\text{ }6000\text{ }kJ\text{ }mo{{l}^{-1}}\] \[\Delta {{S}_{combustion}}=180J/Kmol\] and body temperature is 300 K     

    A) 600 kJ              

    B) 594.6 kJ

    C) 5.4 kJ               

    D) 605.4 kJ

    Correct Answer: D

    Solution :

    [d] No. of moles of sucrose \[=\frac{34.2}{342}=0.1\] \[-{{(\Delta G)}_{T.P}}=\]useful work done by the system \[-\Delta G=-\Delta H+T\Delta S\] \[=+(6000\times 0.1)+\frac{180\times 0.1\times 300}{1000}\] \[=605.4\text{ }kJ\]


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