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Elza [17]
4 years ago
9

If a original sample of radioactive uranium-238 had a mass of 400 grams,what is the total amount of the uranium-238 sample that

would be left after 9 billion years?
Chemistry
1 answer:
laila [671]4 years ago
7 0
Since the half-life is 4.5 billion years, two half-lives would have elapsed after 9 billion years. 
<span>If you start with 400 g, half decays during the first half-life, leaving 200 g. </span>
<span>During the second half-life, half of the 200 g decays, leaving 100 g.</span>
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<em />

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