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

  • question_answer
    The heat evolved in the combustion of benzene is given by                 \[{{C}_{6}}{{H}_{6}}+7\frac{1}{2}{{O}_{2}}\to 6C{{O}_{2}}(g)+3{{H}_{2}}O(l);\,\Delta H=-3264.6\,kJ\]                 Which of the following quantities of heat energy will be evolved when \[39\,g\,{{C}_{6}}{{H}_{6}}\] are burnt [NCERT 1978; MP PET 1990; JIPMER 2001]

    A)                 816.15 kJ             

    B)                 1632.3 kJ

    C)                 6528.2 kJ             

    D)                 2448.45 kJ

    Correct Answer: B

    Solution :

               78g of benzene on combustion produces                    heat = ? 3264.6 kJ                                 \[\therefore 39g\] will produce \[=\frac{-3264.6}{2}=-1632.3\,kJ\].


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