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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2003

  • question_answer
    For the reaction, \[{{N}_{2}}+3{{H}_{2}}\xrightarrow{{}}2N{{H}_{3}}\] which one of the following is correct regarding \[\Delta H\]?

    A)  \[\Delta H=\Delta E-RT\]

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

    C)         \[\Delta H=\Delta E+2RT\]

    D)         \[\Delta H=\Delta E+RT\]

    Correct Answer: B

    Solution :

    For the reaction \[{{N}_{2}}+3{{H}_{4}}\xrightarrow{{}}2N{{H}_{3}}\] Number of gaseous molecules (n)                 \[=2-4=-2\] \[\because \]     \[\Delta H=\Delta E+nRT\]                 \[\Delta E+(-2)RT\]     (\[\because \] \[n=-2\]) \[\therefore \]  \[\Delta H=\Delta E-2RT\]


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