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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    The enthalpy of combustion of \[{{C}_{6}}{{H}_{6}}\] is -3250 kJ, when 0.39 gm of \[{{C}_{6}}{{H}_{6}}\] is burnt in excess of oxygen in an open vessel, the amount of heat evolved is

    A) 8.32 kJ 

    B)        12.36 kJ

    C) 16.25 kJ           

    D)        20.74 kJ

    Correct Answer: C

    Solution :

    [c] \[{{C}_{6}}{{H}_{6}}+\frac{15}{2}{{O}_{2}}\xrightarrow{{}}6C{{O}_{2}}+3{{H}_{2}}O\] 1 mole = 3250 kJ \[\frac{0.39}{78}mole\equiv 3250\times \frac{0.39}{78}=16.25\,\,kJ\]


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