Question
Asked Apr 22, 2019
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1.What is the half-life of 99Tc if a 500.0 g sample decays to 62.5 g in 639,000 years

2)How much of a 100.0 g sample of 198Au is left after 8.10 days if its half-life is 2.70 days?

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Expert Answer

Step 1

Given,

Mass 500 g,

Therefore, the first half-life is 250.0g.

Second ha...

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