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```				   A sample of 10-2 kg each of 2 substances A and B  with half lives of 4 and 8 sec respectively.  The atomic weight of A and B are in the ratio of 1: 2.  Find the amount of A&B after an interval of 16 sec.  Also the report the ratio of initial rates of decay these two.
```

6 years ago

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```										Hi Kiran,
atomic weights ratio of A and B=1:2
implies the no of molecules of B in the sample will be half the no of molecules of A
after 16 seconds:
A will be 10-2/16 kg
B will be 10-2/4 kg
ratio of initial rates = k1*[A]/k2*[B]
k1/k2=8/4 =2  and [A]/[B] = 2
ratio of initial rates = k1*[A]/k2*[B] = 2*2=4
```
6 years ago

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