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Mass lost in a single fusion reaction

  1. Dec 15, 2012 #1
    How much mass is lost in a single D + T= 4He fusion reaction? And is all of the mass lost converted to energy or just some? The mass lost can be converted to energy using e=mc2.
  2. jcsd
  3. Dec 15, 2012 #2


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    Obviously, all of the mass is not converted to energy, since a helium nucleus is produced.

    Your reaction equation is also slightly off:

    D + T = 4He + n

    The energy produced is 17.6 MeV, which is equivalent to about 18.9*10-3 atomic mass units.
  4. Dec 15, 2012 #3
    I don't think you understand what im asking. Im getting roughly around 4.7x10^-29 kg mass lost but I wanted to confirm this. You can convert that to atomic mass units if you wish but I prefer in kg. Thanks
  5. Dec 15, 2012 #4
    which is about 0.0283u of mass lost
  6. Dec 15, 2012 #5


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  7. Dec 15, 2012 #6


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    m(D) + m(T) - m(4He) - m(n) = mass defect and it will be equal to energy produced in the reaction. If you are getting something different, check for errors.
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