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

  • question_answer
    The standard molar heat of formation of ethane, \[C{{O}_{2}}\] and water (l) are respectively ? 21.1, ? 94.1 and ? 68.3 kcal. The standard molar heat of combustion of ethane will be [IIT JEE 1986; DPMT 2005]

    A)                 ? 372 kcal           

    B)                 162 kcal

    C)                 ?240 kcal            

    D)                 183.5 kcal

    Correct Answer: A

    Solution :

              \[{{C}_{2}}{{H}_{6}}+\,\frac{7}{2}{{O}_{2}}\to 2C{{O}_{2}}+3{{H}_{2}}O\] substitute the values.


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