The half life of radioactive cobalt is 527 years if 200, Chemistry

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The half life of radioactive cobalt is 527 years if 200

Question- The half life of radioactive cobalt is 5.27 years. if 200 grams of radioactive cobalt is present now, when will only 20 grams be present?

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Chemistry: The half life of radioactive cobalt is 527 years if 200

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