Question

Green plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water (H2O) and carbon dioxide (CO2) chemically react to form the simple sugar glucose (C6H12O6) and oxygen gas (O2) .

What mass of oxygen gas is produced by the reaction of 3.95 of water?

Answer 1

7.0 grams of oxygen.

Step-by-step explanation:

The balanced equation for photosynthesis is:

6CO2 + 6H2O = C6H12O6 + 6O2

- The amount of water used in the reaction in this case is 3.95 grams. That is equal to 0.22 moles of water (3.95/18.01 = 0.22). (18.01 being the molar mass of water in grams/mole).

- The balanced chemical equation shows that it takes 6 moles of water to form 6 moles of oxygen. So we can infer that 0.22 moles of water would produce 0.22 moles of oxygen in this case. 0.22x31.998 (31.998 being the molar mass of diatomic oxygen in grams/mole) gets us the amount of oxygen produced which is 7.0 grams.