Question: 1 atp is how many joules?
Answer: There are 6,022*10^23 molecules in a mole, and there are 3 phospates in one ATP molecule and 2 of them may be splitted off. 2 * 6,64 * 10^(-20) = 1,33 * 10^(-19) joules. What about the structure of ATP makes it useful as the energy currency of cells?