For the hydrolysis of ATP to ADP + i, the free energy change is ...

[Hawke]

For the hydrolysis of ATP to ADP +  i, the free energy change is -7.3 kcal/mol under standard conditions (1 M concentration of both reactants and products). In the cellular environment, however, the free energy change is about -13 kcal/mol. What can we conclude about the free energy change for the formation of ATP from ADP and  i under cellular conditions?
A) It is +7.3 kcal/mol.
B) It is less than +7.3 kcal/mol.
C) It is about +13 kcal/mol.
D) It is greater than +13 kcal/mol.
E) The information given is insufficient to deduce the free energy change.

[coco]

Try C. I remember this question on my exam.

[Hawke]

Thanks, and your suggestion was right.