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alaina26
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After three half-lives, a sample contains 10 grams of parent isotopes. How many grams of the parent isotope were present to start?

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emilymartiinez

i think that the answer is 40...................................

The answer is actually (80). 80/2 is 40, 40/2 is 20, and 20/2 is 10, thus the answer is 80.

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