The correct response is 22.5kJ of energy released by the reaction.
In this problem, we simply apply the specific heat equation which is:
Heat added = specific heat x mass x change in temperature
It is important to note that only the mass of the calorimeter is important, and masses should all be in grams, energy units are in joules.
mass calorimeter = 1350 g
change in temp = 2.87C
specific heat (calorimeter) = 5.82 J/g.C
heat added = 5.82 X 1350 x 2.87 = 22,549 Joules (J)
divide by 1000 to convert to kilojoules, = 22.5kJ
