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11th Class Physics Thermodynamical Processes Question Bank Critical Thinking

  • question_answer
    The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at \[{{25}^{o}}C\] increases the temperature of 18.94 kg of water by \[{{0.632}^{o}}C\].If the specific heat of water at \[{{25}^{o}}C\] is 0.998 cal/g-deg, the value of the heat combustion of benzoic acid is               [CPMT 1999; BHU 2000]

    A)                 771.1 kcal           

    B)                 871.2 kcal

    C)                 881.1 kcal

    D)                 981.1 kcal

    Correct Answer: A

    Solution :

                    \[Q=\frac{18.94\times 0.632\times 0.998\times 122}{1.89}\]=  \[771.1\,\,Kcal\]


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