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NEET Sample Paper NEET Sample Test Paper-45

  • question_answer
    The enthalpies of combustion of carbon and carbon monoxide are \[-393.5\text{ }and\text{ }-283\text{ }kJ\text{ }mo{{l}^{-1}}\] respectively. The enthalpy of formation of carbon monoxide per mole is-

    A) -110.5 kJ                      

    B) 676.5 kJ

    C) -676.5 kJ                      

    D) 110.5 kJ

    Correct Answer: A

    Solution :

    \[C+\frac{1}{2}\,{{O}_{2}}\,\,\to \,\,CO\] \[\Delta H={{\left( \sum {{H}_{comb}} \right)}_{R}}-{{\left( \sum {{H}_{comb}}. \right)}_{P}}\] \[=\text{ }\left( -393.5 \right)-\left( -283 \right)\] \[=\,\,\,-110.5\,\,kJ\]


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