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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank First law of thermodynamics and Hess law

  • question_answer
    For the reaction \[{{N}_{2}}+3{{H}_{2}}\]⇌\[2N{{H}_{3}};\,\Delta H=\] [Roorkee 2000; CBSE PMT 1991, 2002]

    A)                 \[\Delta E-RT\]

    B)                 \[\Delta E-2RT\]

    C)                 \[\Delta E+RT\]                

    D)                 \[\Delta E+2RT\]

    Correct Answer: B

    Solution :

           \[\Delta H=\Delta E+\Delta nRT\]         Since \[\Delta n=-2\]                                 Than \[\Delta H=\Delta E-2RT\].


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