if the amount of radioactive phosphorus-32 in a sample decreases from 1.2g to 0.30g in 28 days

Chemistry
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if the amount of radioactive phosphorus-32 in a sample decreases from 1.2g to 0.30g in 28 days, what is the half-life of phosphorus-32?

Jul 24th, 2015

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14 days - goes from 1.2 to 0.6 to 0.3. This is two half-lives in 28 days = 14 days per half-life

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Jul 24th, 2015

thank you!

Jul 24th, 2015

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Jul 24th, 2015
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Jul 24th, 2015
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