If a sample has an initial mass of 2.24 grams and undergoes, Ask an Expert

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1- Cobalt-57 has a half-life of about 272 days. If a sample has an initial mass of 2.24 grams and undergoes decay until it has a mass of 0.140 grams, how many half-lives have passed?

2- A sample of Thulium-171 has a mass of 0.4055 grams. How much is left after 6 half-lives?

3- Carbon-10 has a half-life of about 19 seconds. How many half-lives does it undergo in 2 minutes and 32 seconds?

4- A substance has a half-life of 5 years, how much of the initial sample remains after 15 years?

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Category:- Chemistry
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