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Homework Help: The required energy to split up an Oxygen atom

  1. Mar 14, 2013 #1
    1. The problem statement, all variables and given/known data
    "Calculate how much energy that is required for a oxygen atom 168O to split it up into 4 α-particles"

    3. The attempt at a solution
    1: (8 * 1,00727646688)u + (8* 1,00866491578)u = 16,12753105 u
    The first one is the Oxygen's 8 protons and the second one is its 8 neutrons.

    2: 16O = 15,994915 u (Taken from a schedule)
    We also have to discount the 8 electrons: 15,994915 u - (8 * 0,00054858) u = 15,99052636 u

    3: 16,12753105 u - 15,99052636 u = 0,1370146888 u
    That'd be the mass defect.

    How do I then proceed? What should I do next? I'm a bit confused.
    The answer is 14 MeV.
    Thank you :redface:
  2. jcsd
  3. Mar 14, 2013 #2
    If I recall correctly, once you have obtained the mass defect, you should be multiplying by 931.5 to find the mass equivalent to the energy.

    If I'm right, you've made a mistake somewhere. I'm on my iPod at the moment, so there isn't a great deal I can tell you, but when I get to a computer I'll look at it in more detail.
  4. Mar 14, 2013 #3


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    What about the energy of the four alphas?
  5. Mar 15, 2013 #4
    Thanks :P
  6. Mar 15, 2013 #5
    Yeah. It's that. I don't really know how to add their value to it :/
  7. Mar 15, 2013 #6


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    Well, you can calculate it. And then you can compare it to oxygen.
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