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6 November, 01:31

How many half-lives are required for the concentration of reactant to decrease to 25% of its original value?

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  1. 6 November, 03:17
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    Answer: two half lives

    Explanation:

    Initially, there was 100% of the radioactive material present. The first half life decreases the amount of radioactive material present to 50%. The next half life decreases the amount of radioactive material present to 25%. Each half life leaves half the previous percentage of radioactive material initially present in the radioactive material.
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