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Asked by Kathy

The halflife of Phosphorus is 14.3 days, if i start with 100g how long will it take so that only 25g will be left?

One month is my answer, I just need confirmation. Thank you
7 years ago

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Answered by bobpursley`
amount left=original*(1/2)^(days/14.3)
25/100=(1/2)^(days/14.3)
(1/2)^2=(1/2)^(days/14.3)
so days=28.6
7 years ago
Answered by Kathy
Thank you
7 years ago

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