Chem 2/5 Labs    FS/98
Postlab-Radioactivity #468

(1) An element has a rate constant (K) of  3.45 x 10-3  sec-1

(a) What is the half life for the element ?





(b) If we started with 100g of the element,  how much would we have left
     after 700 seconds









(2) What is X in the following reactions ?


      214                   210

           Po  --->            Pb   +    X

      84                      82





     238                                     4

           U  --->        X       +        He

      92                                     2