Atp hydrolysis

to adp and pi is the most common mechanism for transferring free energy to drive endergonic reactions

would be more exergonic if phosphate did not have resonance structures

results in products that are less solvated than the atp

is usually in the form of atp -> adp pi or atp -> amp ppi

The correct answer is to ADP and Pi is the most common mechanism for transferring free energy to drive endergonic reactions.

Explanation:

Many endergonic reactions(the free energy change of these reactions are highly positive) proceed in a thermodynamically unfavorable manner.

     To make those reactions thermodynamically favorable,these reactions are coupled with hydrolysis of high energy compound such as hydrolysis of ATP to ADP and Pi.

    As a result the free energy change of those reactions becomes negative which allow those reactions to proceed in a thermodynamically favorable manner.