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VMMC VMMC Medical Solved Paper-2008

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

    A) \[-321.30-300\text{ }R\]

    B) \[-321.30+300R\]

    C) \[-321.30-150\text{ }R\]

    D) \[-\text{ }321.30\text{ }+\text{ }900\text{ }R\]

    Correct Answer: C

    Solution :

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


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