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NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    For the reaction \[2{{C}_{6}}{{H}_{5}}C{{O}_{2}}H\left( s \right)+15{{O}_{2}}\left( g \right)\xrightarrow{{}}\]\[14C{{O}_{2}}\left( g \right)+6{{H}_{2}}O\left( g \right)\] \[\Delta U{}^\circ =-772.7\text{ }kJ\text{ }mo{{l}^{-1}}\] at 298 K. Calculate \[\Delta H{}^\circ \]

    A) \[+760.3\text{ }kJ\text{ }mo{{l}^{-1}}\]          

    B) \[-760.3\text{ }kJ\text{ }mo{{l}^{-1}}\]

    C) \[+670.3\text{ }kJ\text{ }mo{{l}^{-1}}\]          

    D) \[-790.3\text{ }kJ\text{ }mo{{l}^{-1}}\]

    Correct Answer: B

    Solution :

    [b] \[\Delta {{H}^{{}^\circ }}=\Delta {{U}^{{}^\circ }}+\Delta nRT\] \[\Delta {{H}^{{}^\circ }}=-772.7+\frac{5\times 8.314\times 298}{1000}\] \[=-760.3\text{ }kJ\,mo{{l}^{-1}}\]


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