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

  • question_answer
    If \[C+{{O}_{2}}\to C{{O}_{2}}+94.2\,kcal\] \[{{H}_{2}}+\frac{1}{2}{{O}_{2}}\to \,{{H}_{2}}O+68.3\,kcal\] \[C{{H}_{4}}+2{{O}_{2}}\,\to \,C{{O}_{2}}+2{{H}_{2}}O+210.8\,kcal\] Then the possible heat of methane will be           [UPSEAT 2001]

    A)                 47.3 kcal              

    B)                 20.0 kcal

    C)                 45.9 kcal              

    D)                 ? 47.3 kcal

    Correct Answer: B

    Solution :

           By 2 × (i) + (ii) ? (iii)                                 \[\Delta H\]of methane \[=20.0\,kcal\].


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