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Energy Released by fission

  1. May 21, 2013 #1
    1. The problem statement, all variables and given/known data

    Estimate the energy released, in Joules, by the fission of 1g of U-235 according to the equation:


    [itex]^{235}_{92}{U}[/itex] + [itex]^{1}_{0}{n}[/itex] → [itex]^{144}_{56}{Ba}[/itex] + [itex]^{90}_{36}{Kr}[/itex] + 2[itex]^{1}_{0}{n}[/itex] + Q

    atomic masses:

    [itex]^{235}_{92}{U}[/itex] = 235.04438u

    [itex]^{144}_{56}{Ba}[/itex] = 143.92279u

    [itex]^{90}_{36}{Kr}[/itex] = 89.92089u

    [itex]^{1}_{0}{n}[/itex] = 1.00866u

    Avogadro's number = 6.023 x 1023
    1u = 931MeV
    1MeV = 1.6 x 10-13J

    2. Relevant equations



    3. The attempt at a solution

    (235.04438u + 1.00866u) - (143.92279u + 89.92089u + 1.00866u + 1.00866u) = 0.19204u

    0.19204u x 931 = 178.78924MeV
    178.78924 x 1.6 x 10-13J = 2.86 x 10-11

    Do I then do (6.023 x 1023/235) x 2.86 x 10-11 = 7.33 x 1010J

    For the final answer?

    Thanks
     
  2. jcsd
  3. May 21, 2013 #2
    Looks good to me.
     
  4. May 21, 2013 #3

    Thanks.
     
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