1. The problem statement, all variables and given/known data I've attached the question I'm having trouble with. 2. Relevant equations 3. The attempt at a solution I got an answer of 1.70375 * 10^-3 for the binding energy of a nucleus of uranium 235. For the third part, "When a uranium-235 nucleus undergoes fission..." I read the value of the binding energy per nucleon for a nucleus half the size of uranium's to be 8.5 *10^-13 So I calculated: (1.70375 * 10 ^-3) -(2 * 117.5 * 8.5 * 10 ^-13) = difference in total binding energy. Then I converted this answer in MeV to joules but I got the wrong answer.