If you have the reaction of 40 grams of water decomposing into hydrogen and oxygen what would be the total mass of your products?

Law of conservation of mass.
You put 40 grams in you get 40 grams out. 

This is what i found on google “when one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and atp is converted to adenosine diphosphate (adp). likewise, energy is also released when a phosphate is removed from adp to form adenosine monophosphate (amp).” i hope this you .