Final answer:
The equation 6 CO₂ + 6 H₂O → C6H12O6 + 6 O₂ indicates that there are six molecules of carbon dioxide (CO₂) involved in the reaction.
Step-by-step explanation:
For the equation 6 CO₂ + 6 H₂O → C6H12O6 + 6 O₂, there are six molecules of carbon dioxide (CO₂). This chemical equation represents the process of photosynthesis, where carbon dioxide and water, in the presence of sunlight, are converted into glucose (C6H12O6) and oxygen (O₂). The coefficient '6' in front of CO₂ indicates that six molecules of carbon dioxide are involved in the reaction.