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DIA [1.3K]
2 years ago
11

A sample of rock contains 80 grams of a parent radioactive isotope that has a half-life of 20 000 years. After 100 000 years, th

e number of grams of the parent radioactive isotope remaining is
Chemistry
1 answer:
Tatiana [17]2 years ago
4 0

Answer:

2.5 g

Explanation:

Number of half lives is 100000/20000 = 5 half lives

so (1/2)^5 = 1/32 of the original sample remains

So (80)(1/32)=2.5 g

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