During photosynthesis, one molecule of glucose (C6H12O6) is produced from carbon dioxide (CO2) and water (H2O). The overall equation for photosynthesis can be simplified as follows:
6 CO2 + 6 H2O → C6H12O6 + 6 O2
From this equation, we can see that 6 molecules of water are used to produce one molecule of glucose. Therefore, based on the question regarding how many molecules of water are recycled when one molecule of glucose is created, the answer is:
6