Chemical Kinetics - Result Question 60

####60. 64Cu (half-life =12.8h ) decays by β emission (38 emission (19%) and electron capture (43%). Write the decay products and calculate partial half-lives for each of the decay processes.

(2002)

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Answer:

Correct Answer: 60. (67

Solution:

Extra open brace or missing close brace

Above are the parallel reactions occurring from Cu64.

k1k2=3819=2=T2T1 and k1k3=3843=T3T1

T1,T2 and T3 are the corresponding partial half-lives.

 Also  ln2T=ln2T1+ln2T2+ln3T3 1T=1T1+1T2+1T3=1T1+12T1+4338T1 =1T1(1+12+4338) =1T1(38+19+4338)=10038T1 T1=100T38=10038×12.8=33.68h T2=2T1=67.36h T3=38T143=38×33.6843=29.76h



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