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Warriorz13:
There are 5.0 g of 131I left after 40.35. Hoe many grams were in the original sample if it's half-life is 8.07 days?
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JustSaiyan:
40.35 ÷ 8.07 = 5 ⋅ 2^5 = 160
JustSaiyan:
Any questions?
Warriorz13:
No, has to go feed animals, sorry.
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