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J & K CET Engineering J and K - CET Engineering Solved Paper-2007

  • question_answer
    Heat of combustion of carbon monoxide at constant volume and at \[17{{\,}^{o}}C\]is \[-67,710\,\text{cal}\text{.}\]The heat of combustion at constant pressure is

    A) \[~-68,000\text{ cal}\]  

    B) \[~-67,800\text{ cal}\]

    C) \[~-67,050\text{ cal}\]   

    D) \[~+\,68,500\text{ cal}\]

    Correct Answer: A

    Solution :

     \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g)\] \[\Delta H=\Delta E+\Delta nRT\] \[\Delta H=-67,710-\frac{1}{2}\times 2\times 290\] \[=-68000\,\text{cal}\]


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