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16 May, 16:05

The isotope phosphorus 30 has a half-life of 2.5 minutes you need a 4 g scale of this isotope for an experiment which will take you approximately 15 minutes to prepare in order to have 4 g with experiment begins how much phosphorus 30 should you start with

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  1. 16 May, 16:36
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    Answer: 256g oh phosphorus 30

    Explanation: since the half life is 2.4 min, that mean the mass of phosphorus 30 reduced by half every 2.5 min from a certain amount. That is,

    T1/2 = 2.5 min

    Amount of time the phosphorus disintegrated into two is nT1/2,

    30/2.5 = 6 half lives

    Amount left after 6 half lives n = 4g

    Inittial amount started with = N = ?

    Using N = n x 2^nT1/2

    N = 4 x 2^6 = 4 x 64

    N = 256g
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