A sample initially contains 1.6 moles of a radioactive isotope. How much of the sample remains after
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A sample initially contains 1.6 moles of a radioactive isotope. How much of the sample remains after four half-lives?
(a) 0.0 mol
(b) 0.10 mol
(c) 0.20 mol
(d) 0.40 mol
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