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Manipal Medical Manipal Medical Solved Paper-2008

  • question_answer
    The heat of combustion of solid benzoic acid at constant volume is\[-321.30\text{ }kJ\]at\[27{}^\circ C\]. The heat of combustion at constant pressure is

    A)  \[-321.30-300\text{ }R\]

    B)  \[-321.30+300\text{ }R\]

    C)  \[-321.30-150\text{ }R\]

    D)  \[-321.30+900\text{ }R\]

    Correct Answer: C

    Solution :

     \[{{C}_{6}}{{H}_{5}}COOH(s)+\frac{15}{2}{{O}_{2}}(g)\xrightarrow[{}]{{}}\] \[7C{{O}_{2}}(g)+3{{H}_{2}}O(l)\] \[\Delta {{n}_{g}}={{n}_{p}}-{{n}_{r}}=7-\frac{15}{2}=\frac{-1}{2}\] \[{{q}_{p}}={{q}_{v}}+\Delta {{n}_{g}}(RT)\] \[=-321.30+\left( -\frac{1}{2} \right)300R\] \[=-321.30-150\text{ }R\]


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