2. Solved Papers
  3. AMU Medical

AMU Medical AMU Solved Paper-2008

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

    A)  -321.30- 300 R

    B)  - 321.30 + 300 R

    C)  -321.30-150 R

    D)  -321.30+900R

    Correct Answer: C

    Solution :

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


You need to login to perform this action.
You will be redirected in 3 sec spinner