I have just started AP Chemistry this year as a junior at my highschool despite all peer protests against it. And I admit so far the course has lived up to it's reputation of being very difficult. I was rather ecstatic to come across this site where I may obtain the help I /know/ I will need all year. So expect to see me often. ^_^ We use the 7th edition Chemistry textbook by Zumdahl, so I believe my source is familiar to at least some. 1. The problem statement, all variables and given/known data Calculate the energy released per (4 mass #, 2 Protons)He nucleus produced and per moles of (4 mass #, 2 Protons)He produced. The atomic masses are (2,1)H, 2.01410; (3,1)H, 3.01605; and (4,2)He, 4.00260. The masses of the electron and neutron are 5.4858 x 10 raised to the -4 and 1.00866 amu, respectively. 2. Relevant equations The easiest fusion reaction to initiate is (2,1) H + (3,1) H ---> (4,2) He + (0,1) n 3. The attempt at a solution ∆m = (4.00260 + 1.00866) - (2.01410 + 3.01605) = -1.02755 amu (Originally I had the two enclosed equations swapped which would give a positive result instead. Would this matter? If so, why?) For Mole; -1.02755 amu = 1.6005 x 10 to the -27 Kg / 1 amu = -1.6446 Kg E= mc squared, so: -1.6446 Kg x (2.997 x 10 to the 8) Squared = 49289 J For Nucleus; I was unsure how to find this, but I found that 1 mol = 6.0221 x 10 to the 23 nuclei So do I need to convert Kg into mol and then into nuclei?