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8 May, 20:52

Erwin was measuring a radioactive substance in the laboratory. He measured 8.0 kg of substance X at noon Tuesday. At noon Friday, three days later, Erwin measured 1.0 kg of substance X. What is the half-life of substance X? Explain your answer.

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  1. 8 May, 22:32
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    The half live of the substance would be 9 hours

    24x3=72

    72/8=9

    half life would be 9 hours
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