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11th Class Physics Thermodynamical Processes Question Bank Critical Thinking

  • question_answer
    For the reaction \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g)\,\,\to \,\,{{H}_{2}}O(l),\,\Delta H=-285.8\,\,kJ\,\,mo{{l}^{-1}}\]\[\Delta S=-0.163\,kJ\,mo{{l}^{-1}}{{K}^{-1}}.\] What is the value of free energy change at \[{{27}^{o}}C\] for the reaction?                 [KCET 1999]

    A)                 \[-236.9\,kJ\,mo{{l}^{-1}}\]        

    B)                 \[-\,281.4\,kJ\,mo{{l}^{-1}}\]

    C)                 \[-\,334.7\,kJ\,mo{{l}^{-1}}\]     

    D)                 \[+334.7\,kJ\,mo{{l}^{-1}}\]

    Correct Answer: A

    Solution :

           \[\Delta G=\Delta H-T\Delta S\,\,\,,\,T=27+273=300\,K\]                                 \[\Delta G=(-285.8)-(300)(-0.163)=-236.9\,kJ\,mo{{l}^{-1}}\]


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