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NEET NEET SOLVED PAPER 2015 (Re)

  • question_answer
    The heat of combustion of carbon to \[C{{O}_{2}}\] is \[-393.5\,kJ/mol\]. The heat released upon the formation of 35.2 g of \[C{{O}_{2}}\]from carbon and oxygen gas is                                                                                   

    A)  \[-315\,kJ\]       

    B)  \[+315\,kJ\]      

    C)  \[-630\,kJ\]       

    D)  \[-3.15kJ\]

    Correct Answer: A

    Solution :

    Given, \[C(s)+{{O}_{2}}(g)\xrightarrow{\,}\,C{{O}_{2}}(g);\] \[{{\Delta }_{f}}H=-393.5\text{kJ}\,\text{mo}{{\text{l}}^{-1}}\] \[\because \]Heat released on formation of 44 g or 1 mole \[C{{O}_{2}}=-395.5kJmo{{l}^{-1}}\] \[\because \]Heat released on formation of 35.2 g of \[C{{O}_{2}}\] \[=\frac{-393.5kJmo{{l}^{-1}}}{44g}\times 35.2g=-315kJmo{{l}^{-1}}\]


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