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Homework Help: Bomb calorimetry

  1. Oct 1, 2007 #1
    Need help!! I tried using the equation: Heat evolved= (specific heat)(Mass of Solution)(Change in Temp) but I cannot get the right answer.

    In a coffee-cup calorimeter, 1.30 g of NH4NO3 is mixed with 75.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.19°C. Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
  2. jcsd
  3. Nov 8, 2016 #2


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    ((1.3+75)x4.18x1.81x0.001)kJ / (1.30/80)mol = 35.5 kJ/mol
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