Why does hydrolysis of ADP to AMP yields the same amount of energy as ATP to ADP, if ADP is more stable?
ATP has two high energy bonds which are phosphoanhydride bonds. Both bonds release the same amount of energy. Therefore, when ATP converts to ADP, breaks one phosphoanhydride bond, and releases -30.5 kJ/mol. When the 2nd bond is broken in ADP releases -30.5 kJ/mol because it is the same phosphoanhydride bond. However, AMP has only a phosphate ester bond which releases -61 kJ/mol.
The &quot;less stability&quot; of ATP doesn't affect energy yield.