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AMU Medical AMU Solved Paper-2014

  • question_answer
    Enthalpy of combustion of carbon to \[C{{O}_{2}}\] is -393.5 kJ \[mo{{l}^{-1}}\]. What amount of heat will be released upon formation of 35.2 g of \[C{{O}_{2}}\] from carbon and oxygen gas?

    A)  214.8kJ               

    B)  314.8kJ

    C)  414.8kJ               

    D)  514.8kJ

    Correct Answer: B

    Solution :

    \[\underset{12\,\,g}{\mathop{C+}}\,\,\,\,\,\underset{32\,\,g}{\mathop{{{O}_{2}}}}\,\xrightarrow{{}}\underset{44\,\,g}{\mathop{C{{O}_{2}}}}\,\,;\,{{\Delta }_{c}}H=-393.5\,kJ\,mo{{l}^{-1}}\] \[\because \] Due to \[44\,g\,C{{O}_{2}}\], heat releases = 393.5 kJ \[\therefore \] Due to 35.2 g \[C{{O}_{2}}\], heat releases                 \[=\frac{393.5\times 35.2}{44}\]                 = 314.8 kJ


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