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

  • question_answer
    Given that \[C(s)+{{O}_{2}}(g)\to C{{O}_{2}}(g),\Delta H=-394kJ\] \[2{{H}_{2}}(g)+{{O}_{2}}(g)\to 2{{H}_{2}}O(l),\,\Delta H=568kJ\] \[C{{H}_{4}}(g)+2{{O}_{2}}(g)\,\,\to \,\,C{{O}_{2}}(g)+2{{H}_{2}}O(l)\]\[\Delta H=-892\,kJ\] Heat of formation of \[C{{H}_{4}}\] is                                     [DCE 1999]

    A)                 ? 70 kJ  

    B)                 71.8 kJ

    C)                 ? 244 kJ               

    D)                 + 782 kJ

    Correct Answer: A

    Solution :

           \[C+{{O}_{2}}\to C{{O}_{2}},\,\,\,\,\Delta H=-394\,kJ\]          ?..(i)            \[2{{H}_{2}}+{{O}_{2}}\to 2{{H}_{2}}O,\,\,\,\Delta H=-568\,kJ\]      ?.(ii)                    \[C{{H}_{4}}+2{{O}_{2}}\to C{{O}_{2}}+2{{H}_{2}}O,\,\,\,\Delta H=-892\,kJ\]    ?..(iii)                                 (i) + (ii) ? (iii) and find the required result.


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