Manipal Medical Manipal Medical Solved Paper-2012

  • question_answer
    Enthalpy of combustion of carbon to\[C{{O}_{2}}\]is\[-393.5\,kJ\,mo{{l}^{-1}}.\]The heat released upon formation of 35.2 g of\[C{{O}_{2}}\]from carbon and dioxygen   gas   is   (molar   mass   of \[C{{O}_{2}}=44\,g\,mo{{l}^{-1}}\])

    A)  3.148 kJ         

    B)  31.48 kJ

    C)  314.8 kJ         

    D)  3148 kJ

    Correct Answer: C

    Solution :

     \[C(s)+{{O}_{2}}(g)\xrightarrow[{}]{{}}\underset{44\,g}{\mathop{C{{O}_{2}}(g);}}\,\] \[\Delta H=-393.5\text{ }kJ\text{ }mo{{l}^{-1}}\] Heat released in the formation of \[44\text{ }g\,C{{O}_{2}}=393.5\text{ }kJ\] \[\therefore \] Heat released in the formation of \[35.2\text{ }g\,C{{O}_{2}}=\frac{393.5\,kJ\times 35.2\,g}{44\,g}\] \[=314.8\text{ }kJ\]


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