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Glucose has high potential energy that can be utilized as an energy source. The series of enzymatic reactions that break down glucose into CO2 and H2O (cellular respiration) has an overall negative enthalpy (deltaH < 0) since energy is released. In other words, the enthalpy of the products, CO2 and H2O, is less than the enthalpy of the reactants.
Glucose is a great source of chemical potential energy. The oxidation of glucose releases 2880 kJ of energy/mol, 2823 kJ of which is available to do work. Although eukaryotic cells cannot harness all of this energy, cellular respiration is still ~34% efficient in converting the chemical energy of glucose into the more readily available form found in ATP.
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