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If energy is stored in chemical bonds, and bond formation is always an exothermic process, doesn't that imply that bond formation both stores and releases energy? How is this possible? I'm clearly not understanding some basic tenet of chemistry. For example, H+ and OH- neutralize to form H2O.
Is this reaction Endothermic The combustion of propane in oxygen to produce carbon dioxide and water vapor.   All the combustion reactions I know of are exothermic because heat is released instead of absorbed. And propane gives more energy than methane cause it has more Cs and H â¦ s to react with Oxygen, so one mole of propane will react more and form more product than one mole of methane and giving out more energy.