A 221.3 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 27.66 ng. How many half‑lives of the unknown radioactive substance have occurred?

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13-06-2024
Chemistry

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A 221.3 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 27.66 ng. How many half‑lives of the unknown radioactive substance have occurred?

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