Final answer:
The energy release in kcal when 3 mol of oxygen react with glucose is approximately 2014 kcal.
Step-by-step explanation:
The combustion of glucose with oxygen gas produces carbon dioxide and water. This process releases 2803 kJ of energy per mole of glucose. To find the energy release in kcal when 3 mol of oxygen react with glucose, we need to calculate the total energy released.
We know that the energy released per mole of glucose is 2803 kJ. Therefore, the total energy released when 3 mol of oxygen react with glucose can be calculated by multiplying the energy released per mole of glucose by the number of moles of glucose:
Total energy release = (2803 kJ/mol) * (3 mol) = 8409 kJ
Since 1 kcal is equal to 4.18 kJ, we can convert the energy release from kJ to kcal:
Total energy release in kcal = 8409 kJ * (1 kcal/4.18 kJ) ≈ 2014 kcal