Use the reaction equation and bond energies to answer the question. What is the total energy of the reaction? Is this an endothermic or exothermic reaction?
2H2) --> 2H2 + O2
H-O: 467 kJ/mol
H-H: 432 kJ/mol
O=O: 495 kJ/mol
–509 kJ/mol, exothermic
–509 kJ/mol, endothermic
509 kJ/mol, endothermic
509 kJ/mol, exothermic
please explain why too
1 answer
509 kJ/mol, exothermic. This reaction is exothermic because the total energy of the reaction is the difference between the bond energies of the reactants and the products. The bond energies of the reactants (2H2) is 864 kJ/mol, while the bond energies of the products (2H2 + O2) is 1373 kJ/mol. The difference between these two values is 509 kJ/mol, which is the total energy of the reaction. Since the total energy of the reaction is positive, this indicates that energy is released during the reaction, making it an exothermic reaction.
1 answer