Post-Lab for Expt 468
WS99

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TA Name__________________

1.  A material has a 1/2 life of 2.6 years.  If you start with 175 grams of
the material, how much will remain after 1000 days?  (Assume 365 days = 1 yr)
(1 pt)
















2. Determine X in each of the following reactions. (4 pts)

a)  131            93         35
          I ------>   Kr   +    Cl   +   X
      53             36         17



b)  235           1            87       146
           U    +    n --->     Br   +    X     +    X
       92           0           X         57