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Phosphorus-32 a radioisotope used in the treatment of leukemia has a half life of 14.3 days of a sample contains 16.0 mg of phosphorus 32,

Phosphorus-32 a radioisotope used in the treatment of leukemia has a half life of 14.3 days of a sample contains 16.0 mg of phosphorus 32, how many milligrams of phosphorus 32 remains after 28.6 days?

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