After 706 days the amount of radioactive substance had
A 50.0 mg sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 70.6 days, the amount of radioactive substance had decreased to 3.13 mg. What is the half-life of the unknown radioactive substance?
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a 500 mg sample of an unknown radioactive substance was placed in storage and its mass measured periodically after 706
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