Answer:
231.0 kJ
Step-by-step explanation:
Chemical reactions releasing heat energy are exothermic reactions.
The chemical reaction released 55.2 kcal
1 kcal is equivalent to 4.184 kJ
Therefore 55.2 kcal is equivalent to - 4.184 kJ/kcal x 55.2 kcal
the energy in kJ is - 231.0 kJ