What is the type of chemical reaction used to rebuild adp into atp? what is the type of chemical reaction used to rebuild adp into atp? rehydration synthesis dehydration synthesis hydrolysis?

The type of chemical reaction used to rebuild ADP into ATP is the dehydration synthesis. This is a process of joining two molecules, or compounds together following the removal of water. ATP is synthesized from ADP and inorganic phosphate via an energy requiring dehydration synthesis, and is converted back to ADP in the course of hydrolysis reaction.

The mass has escaped into a gas which you can not see so the law stays true.