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What is the mass of phosphorus-32 with an atomic mass of 32.0 after 35 days?

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What is the mass of phosphorus-32 with an atomic mass of 32.0 after 35 days?

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  1. P-32 has a half life of 14.3 days (says wikipedia, see source)

    after 32 days only:

    0.5^(35 / 14.3) = 0.183321456 moles will be left of each mole at day 0.

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