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25 grams of radon-222 remains after 15.28 days. How much radon was in the original sample? Write an equation for the decay of radon-222.

Respuesta :

Answer:

half-life = 3.8 days

total time of decay = 15.2 days

initial amount = 100. g

number of half-lives past: 15.2/3.8 = 4 half-lives

4 half-lives = 1/16 remains

100. g x 1/16 = 6.25 g

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