According to the Merck Index, Adenosine Triphosphate has molecular formula of C10H16N5O13P3 and a Molecular weight of 507.18. The disodium form has a Molecular Weight of 551.14 through the addition of 2 Na+ molecules. The molecule operates as a key coenzyme inside the cell and is involved providing the energy required to fuel chemical reactions.
To learn more about how Adenosine Triphosphate works inside the cell view the following links:
http://www.youtube.com/watch?v=um271UmTJ2I&feature=relmfu