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14-02-2020
Chemistry

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

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pstnonsonjoku pstnonsonjoku

15-02-2020

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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