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VIT Engineering VIT Engineering Solved Paper-2014

  • question_answer
    The standard molar heat of formation of ethane, \[\text{C}{{\text{O}}_{\text{2}}}\]and water (l) are respectively -21.1, -94.1 and - 68.3 kcal. The standard molar heat of combustion of ethane will be

    A) -372 kcal              

    B) 162 kcal

    C) -240 kcal                              

    D) 183.5 kcal

    Correct Answer: A

    Solution :

    Given (i) \[=\frac{1\times {{\left( 2 \right)}^{2}}}{{{\left( 400 \right)}^{2}}}\] (ii) \[=25\mu F\] (iii) \[\overline{B}.C=Y'\] Eqs. 2 (ii) + 3 (iii) ? (i) \[A+\left( \overline{B}.\overline{C} \right)=Y''\] \[\overline{A+\overline{B}.C}=Y\]                     = - 372 kcal


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