The specific rate constant, $k$, for radioactive beryllium-11 is 0.049 s${}^{-1}$. What mass of a 0.500-mg sample of beryllium-11 remains after 28 seconds?
A.
0.250 mg
B.
0.125 mg
C.
0.0625 mg
D.
0.375 mg
Exam No：AP Chemistry Problem Set 1 Year：2024 Question No：APChemistry2024AP0379
Answer:
B
Knowledge points:
5.3 Concentration Changes Over Time
Solution:
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