CHEMISTRY 115

HOMEWORK 9

NAME _____________________

DUE June 6, 01

 

COMP HMWRK:23, 1-6
  1. Calculate the binding energy in J/nucleon of the tritium nucleus whose mass is 3.01550u.
  2. Complete the following nuclear reaction by writing the symbols for the missing particles.
    1. 24596Cm à 42He + _____
    2. 14656Ba à o-1e + _______

      3.  

    3. 6832Ge à electron captureà ______

 

 

  1. Write a balanced nuclear equation for each of the following nuclear reactions.
  1. electron capture by iron-55

 
  1. positron emission by ruthenium-93

    2.  

  2. alpha emission by californium-251

 

 

  1. For each of the nucleotides formed by the mode described, write the symbol for the parents giving the symbol and the atomic and mass numbers
  1. rubidium-80 formed by electron capture

 

b) chromium-50 formed by positron emission

 

5. How much would be left of a 9.00 ng sample of techetium-99 after 4 half lives have elapsed.

 

 

 

6. A wooden door lintel 9.0 x 103 yrs old, from an excavated site in Mexico would be expected to have what C-14 to C-12 ratio.

Ratio = |_________