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

  • question_answer
    For the reaction \[A(g)+2B(g)\to 2C(g)+3D(g)\], the value of \[\Delta E\] at \[{{27}^{o}}C\] is 19.0 kcal. The value of \[\Delta H\] for the reaction would be \[(R=2.0\,cal\,{{K}^{-1}}mo{{l}^{-1}})\] [Roorkee Qualifying 1998]

    A)                 20.8 kcal              

    B)                 19.8 kcal

    C)                 18.8 kcal              

    D)                 20.2 kcal

    Correct Answer: D

    Solution :

           Use \[\Delta H=\Delta E+\Delta n\,RT\]                 \[\Delta H=19+2\times 2\times {{10}^{-3}}\times 300\]\[=20.2\,kcal\]; \[\Delta n=2\].


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