Calculating enthalpy in a Coffee Cup calorimetry?
A total of 2.00 mol of a compound is allowed to react in a foam coffee cup that contains 192 g of water. The reaction caused the temperature of the water to rise from 21.0 to 24.7 degrees C. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself.
Specific heat capacity of water c = 4.18 J/g-K
Heat released = m * c * (t2 - t1)
= 192 x 4.18 x (24.7 - 21.0)
= 2969.472 J
Number of moles = 2.00
Therefore enthalpy = 2969.472/2.00 J/mol
= 1485 J/mol
= 1.485 kJ/mol
Ans: 1.485 kJ/mol
Note: I used specific heat capacity of water = 4.18 J/g-K. Some authors use slightly different value. Use the value given in your book.
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