Energy Calculated

[seders99]

Heres the question:

Approximately what % of the energy of glucose is transferred to storage in ATP as a result of the complete oxidation of glucose to CO2 and water in cellular respiration?

I know oxidation means the loss of electrons. The offered answers are:
2%
4%
10%
25%
none of the amount

I am not looking for the answer, just interested in how this is calculated for further references. Where do I begin to understand this. THANKS

[MrMistery]

the hydrolysis of one mole of ATP yields 7.3 kcal. The hydrolysis of one mole of glucose yields 686 kcal. If you know enough about cell respiration you know how many moles of ATP are produced from each mole of glucose. Then you can just multiply that and see how much of the energy in the glucose is still there in ATP.

PS: for the future, it is a value that is useful to memorize

[futurezoologist]

36 ADP+P molecules bonded from one glucose in cellular respiration(sometimes 38).
+ MrMistery's numbers and you got yourself an answer.