Seudónimo Seudónimo

25-05-2017
Chemistry

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You started with 64 g of a radioactive substance. If you have 4.0 g of that substance left, then how many half-lives have elapsed?
a. 2
b. 3
c. 4
d. 5

Respuesta :

dakotastardy dakotastardy

25-05-2017

4 half lives have elapsed

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