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CET Karnataka Medical CET - Karnataka Medical 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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