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?

Question

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

Answer 1

509 kJ/mol, exothermic