Chemical Kinetics - Result Question 79

####78. Radioactive decay is a first order process. Radioactive carbon in wood sample decays with a half-life of 5770yr. What is the rate constant ( in yr1 ) for the decay? What fraction would remain after 11540yr ?

(1984, 3M)

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Solution:

  1. k=ln2t1/2=0.6935770yr1=1.2×104yr1

Also kt=ln1f=ln25770×11540=ln4f=14=0.25



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