If, when electrolyzing water (2H2O --> 2H2 + O2), the total bond energy of the reactants is 2000kJ and the total bond energy of the products is 934kJ, what is the total energy of the reaction and is this an endothermic or exothermic reaction?
1066kJ, exothermic
-1066kJ, exothermic
-1066kJ, endothermic
1066kJ, endothermic
The total energy of the reaction is the total bond energy of the reactants minus the total bond energy of the products.
Total energy = 2000kJ - 934kJ = 1066kJ
Since the total energy of the reaction is positive (1066kJ), this means that energy is released during the reaction, making it exothermic. Therefore, the correct answer is:
1066kJ, exothermic