1. The problem statement, all variables and given/known data Two deuterium nuclei (deuterium= 2.014102u) combine thru fusion to form a tritium nucleus (mass 3.016050u) and a proton. 2. Attempt at solution Two parts to this problem: a) Calculate the energy released in one fusion reaction (in MeV). So for this I went [(initial masses)-(final masses)]c^2. So [(2x2.014102u)-(3.016050u + 1.007276u)]931.5 MeV/u (we are given c^2=931.5MeV/u) So I get 4.54 MeV. The answer is supposed to be 4.03 MeV. What am I doing wrong? b)Calculate the ratio of enery released from 1.00x10^22 deuterium nuclei to 1kg of gasoline (5.00x10^7 J). Using the correct answer from part a, I go: 4.03 Mev x 1.00x10^22 / ((5.00x10^7 J x 1 eV/1.60x10^-19 J) x 1MeV / 10^6 eV) and i get 128.96. The correct answer is 64.6. Again, what am I doing wrong :p. Thanks for the help in advance!