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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Heat of reaction

  • question_answer
    The \[\Delta H_{f}^{o}\] for \[C{{O}_{2}}(g),\,CO(g)\] and \[{{H}_{2}}O(g)\] are ? 393.5,       ?110.5 and ? 241.8kJmol?1 respectively. The standard enthalpy change  (in kJ) for the reaction \[C{{O}_{2}}(g)+{{H}_{2}}(g)\to \] \[CO(g)+{{H}_{2}}O(g)\] is           [IIT JEE (Screening) 2000]

    A)                 524.1    

    B)                 41.2

    C)                 ? 262.5 

    D)                 ? 41.2

    Correct Answer: B

    Solution :

           \[C+{{O}_{2}}\to C{{O}_{2(g)}},\,\,\,\Delta H_{f}^{o}=-393.5\,kJ\,mo{{l}^{-1}}\]  ?.(i)            \[C+\frac{1}{2}{{O}_{2}}\to C{{O}_{(g)}},\,\,\,\Delta H_{f}^{o}=-110.5\,kJ\,mo{{l}^{-1}}\]   ?.(ii)                    \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to {{H}_{2}}{{O}_{(g)}},\,\,\,\Delta H_{f}^{o}\]\[=-241.8\,kJmo{{l}^{-1}}\]                   ...(iii)                    By (ii) + (iii) ? (i)                                 \[C{{O}_{2(g)}}+{{H}_{2(g)}}\to C{{O}_{(g)}}+{{H}_{2}}{{O}_{(g)}},\,\,\,\Delta H=+41.2\].


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