Suppose that a small plant, through photosynthesis, has generated 12 trillion molecules of glucose. based on what you know about the process of photosynthesis, the cell has generated molecules of oxygen.

The reaction involved in a photosynthesis is expressed as: 6CO2+12H2O+light->C6H12O6+6O2+6H2O. As when can see, there is a 1:6 ratio of the glucose and oxygen products. So, producing 12 trillion glucose would mean the O2 generated is 6 of the glucose and is equal to 72 trillion molecules of O2.