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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2008

  • question_answer
    If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

    A)  \[\Delta H>\Delta U\]                  

    B)  \[\Delta H=\Delta U\]

    C)  \[\Delta H<\Delta U\]

    D)  there is no relationship

    Correct Answer: C

    Solution :

    \[\underset{1\,\,mol}{\mathop{N{{H}_{3}}(g)}}\,+\underset{1\,\,mol}{\mathop{HCl(g)}}\,\xrightarrow{{}}\underset{1\,\,mol}{\mathop{N{{H}_{4}}Cl(g)}}\,\]                 \[\Delta H=\Delta U+{{n}_{g}}RT\]                 \[{{n}_{g}}=\] Number of moles of product                                 - number of moles of reactant                 \[=1-2=-1\]                 \[\Delta H=\Delta U-RT\] \[\therefore \]  \[\Delta H<\Delta U\]


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