J & K CET Engineering J and K - CET Engineering Solved Paper-2012

  • question_answer
    Enthalpy of combustion of carbon to \[\text{C}{{\text{O}}_{\text{2}}}\] is \[-393.52\,\text{kJ/mol}\text{.}\] The heat released upon formation of 11 g of \[\text{C}{{\text{O}}_{\text{2}}}\]from carbon and dioxygen is

    A)  35.77 kJ

    B)  98.38 kJ

    C)  1574.08 kJ

    D)  393.52 kJ

    Correct Answer: B

    Solution :

     The heat released upon formation of \[\text{C}{{\text{O}}_{\text{2}}}\]will be \[\text{+}\,\,\text{393}\text{.52 kJ/mol}\] 1 mol \[C{{O}_{2}}=44\,g\]of \[\text{C}{{\text{O}}_{\text{2}}}\] So, for 44 gm of\[\text{C}{{\text{O}}_{\text{2}}}\]formation energy released is \[\text{+}\,\text{393}\text{.52 kJ}\] \[\therefore \] for 11 g of \[\text{C}{{\text{O}}_{\text{2}}}\] formation energy released \[=\frac{393.52}{44}\times 11\] \[=98.38\,kJ\]


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