Chemistry, 02.10.2019 03:00 1969976289

The original amount of radioactive substance is 10 grams. after several years, 2.5 gtams of the substance is remaining. how many half-lives havr passed since the mass of the subtance was 10 grams?

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The original amount of radioactive substance is 10 grams. after several years, 2.5 gtams of the subs...

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