The overall equation for the cellular respiration of glucose is c6h12o6 + 6 o2 → 6 co2 + 6 h2o + energy. c5h12o6 + 6 o2 → 5 co2 + 6 h2o + energy. 5 co2 + 6 h2o → c5h12o6 + 6 o2 + energy. c6h12o6 + energy → 6 co2+ 6 h2o + 6 o2. r

The answer to your question is: first option.

Explanation:

C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy.  This option is correct, 1 molecule of glucose reacts with 6 molecules of oxygen and produces 6 molecules of carbon dioxide, six molecules of water and energy.

C5H12O6 + 6 O2 → 5 CO2 + 6 H2O + energy. This option is incorrect because glucose has 6 carbons not five.

5 CO2 + 6 H2O → C5H12O6 + 6 O2 + energy. This is the reaction of photosynthesis, it is the inverse reaction of cellular respiration.

C6H12O6 + energy → 6 CO2+ 6 H2O + 6 O2. This reaction does not exist.