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Homework Help: Energy Released in Fission Reaction

  1. Dec 1, 2007 #1
    1. The problem statement, all variables and given/known data

    A typical fission reaction is
    U(92,235) → Zr(40,98) + Te(52,135) + 2 n

    The numbers in parentheses are (Z,A) for each isotope; n stands for a neutron.

    The atomic masses of the isotopes are: U(92,235) = 235.043923 u; Zr(40,98) = 97.912746 u; Te(52,135) = 134.916450 u; n = 1.008665 u.

    How much mass energy is released in the fission reaction? Use this number as typical of fission reactions. (Express the answer in MeV.)

    2. Relevant equations

    E = mc^2

    (The atomic mass unit is 1 u = 931.5 MeV/c^2 = 1.67 ×10−27 kg where c is the speed of light.)

    3. The attempt at a solution

    I've calculated the loss of the the reaction to be 3.37E-28 kg, then tried plugging it into E = mc^2, but it did not work.
  2. jcsd
  3. Dec 1, 2007 #2
    3.37E-28 kg
    How did you calculate that?
  4. Dec 1, 2007 #3
    Never mind, I did it wrong, I got the correct answer of 183.9 MeV.
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