The complete oxidation of glucose (c6h12o6) to carbon dioxide and water in aerobic respiration consumes how many molecules of oxygen (o2) ?

Answer is: 6 molecules of oxygen.

First, write down reaction for aerobic respiration:

C₆H₁₂O₆ (glucose) + 6O₆ (molecule of oxygen) → 6CO₂ (carbon-dioxide) + 6H₂O (water).

Reaction shows that one molecule of glucose react with six molecules of oxygen.

Aerobic respiration requires oxygen to create energy.