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11 December, 03:38

The half-life of radioactive element krypton-91 is 10 seconds. if 16 grams of krypton-91 are initially present, how many grams are present after 10 seconds? after 50 seconds?

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  1. 11 December, 07:21
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    10 seconds = 8grams

    then just divide by 2 another 4 times ...

    = 0.5grams after 50 seconds
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