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OpenStudy (anonymous):
An 80.0 mg sample of a radioisotope is reduced to 5.0 mg after 22.0 hours. What is the half-life of this isotope in hours?
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OpenStudy (anonymous):
80>40>20>10>5 = 4 (because halved 4 times) So im assuming 22/4 = 5.5 (hours I think)
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