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9 July, 04:25

The half-life of Plutonium-23 is 30 min. How much of a 1500 mg sample will be left 5 hours from now?

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  1. 9 July, 04:33
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    Half life means exactly 1/2 of what's left decays

    example

    if yo has 16grams

    if half life is 1 hour, after 1 hour, 8g is left

    after another hour, 4g is left

    after another your, 2g is left

    etc

    so find how many half lifes have elapes

    so

    the amount left after n halflives when you start with P amount is

    A=P (1/2) ^n

    5hr=60*5=300mins

    300/30=10

    10 half lifves

    P=1500

    n=10

    A=1500 (1/2) ^10

    A=375/256

    A≈1.46484g

    about 1.5g left
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