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30 July, 07:31

What is the mass of an original 5.60 gram sample of iron 53 that remains on uncharge after 25.53 minutes?

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  1. 30 July, 07:44
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    Answer is: 0,7g.

    m (Fe) = 5,60g.

    t1/2 (Fe-53) = 8,51 min.

    t1/2 - half-life of iron.

    25.53 min/8.51 min = 3 half lives.

    one half-life - mass of iron is reduced by half.

    first half life - 5,60g → 2,80g.

    second half life - 2,80g → 1,40g.

    third half-life - 1,40g → 0,7g.
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