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Solved: Po-218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains
Chapter 17, Problem 94P(choose chapter or problem)
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QUESTION:
Problem 94P
Po-218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains 55 mg of Po-218, how many alpha emissions occur in 6.0 minutes?
ANSWER:
Solution:
Step 1
If the half life is 3.0 min, after 6.0 minutes the number of lifetimes will be
6.0 / 3.0= 2.
The final mass of Po will be:
M(Po-f) = Mo ( 1 / 2n = 55 )
1 / 22 = 55
55 / 4 = 13.75 mg = 0.01375 g
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