Which equation correctly represents aerobic respiration?
Glucose + O2 → CO2 + H2O + Energy
Aerobic respiration is the breakdown of food in the presence of oxygen. Glucose is first broken into pyruvate in the cytoplasm, and pyruvate is then completely oxidised in the mitochondria.
The end products are carbon dioxide and water, and a large amount of energy is released and stored as ATP. The overall equation is C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy, that is, glucose + oxygen gives carbon dioxide + water + energy.
Glucose giving alcohol, carbon dioxide and energy is anaerobic respiration (fermentation) in yeast, and glucose giving lactic acid and energy is anaerobic respiration in muscle cells during heavy exercise; neither uses oxygen.
An equation in which glucose reacts with carbon dioxide to release oxygen and water has the reactants and products the wrong way round; using carbon dioxide and releasing oxygen is characteristic of photosynthesis, not respiration.
Hence, Glucose + O2 → CO2 + H2O + Energy.
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