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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Sample Paper Topic Test - Thermo Chemistry (Thermodynamics)

  • question_answer
    A coffee cup calorimeter initially contains 125 g of water, at a temperature of \[24.2{}^\circ C\]. 8 g of ammonium nitrate \[(N{{H}_{4}}N{{O}_{3}}),\] also at \[24.2{}^\circ C,\] is added to the water, and the final temperature is \[18.2{}^\circ C\] what is the heat of solution of ammonium nitrate in kJ/mol? The specific heat capacity of the solution is \[4.2\text{ }J/{}^\circ Cg\].

    A) 33.51 kJ/mol

    B) 39.5 kJ/mol

    C) 32.2 kJ/mol

    D) 37.3 kJ/mol

    Correct Answer: A

    Solution :

    [a] \[\Delta {{H}_{solution}}=\frac{(125+8)\times 4.2\times 6}{8}\times 80=33516J/mol\] \[33.51\,\,kJ/mol.\]


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