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Homework Help: Reactant nuclei and product nuclei

  1. Oct 19, 2014 #1
    1. The problem statement, all variables and given/known data
    in the photo, the 23Na form 24Na Am i right?

    if i am right, the mass of 23Na should decraese , and mass of 24Na should increase.
    but why the solution provided is the mass of 24Na decreses and increases at the time of delta t ?? i cant understand

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Oct 19, 2014 #2


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    2017 Award

    Staff: Mentor

    23Na can capture a neutron to become 24Na.
    The number of 23Na atoms decreases, but at a negligible rate.
    The number of 24Na atoms increases by the production and decreases from the decays - if you start from 0 and have a constant production rate the net effect is always an increase (but getting slower and slower close to the equilibrium), and this is represented by the formula.
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